Urnex Cleaner Guide: Maintain Pristine Espresso Machines

Dirty coffee equipment is the most common cause of bitter, off-tasting shots that no grind adjustment can fix. Urnex is the brand that coffee professionals and home baristas trust most for cleaning espresso machines, grinders, and brewing equipment, and understanding exactly which Urnex product to use, at what concentration, and how often, is what separates consistently clean equipment from a machine quietly building up oils and scale with every shot.

This guide covers every major Urnex cleaner, including Cafiza, Biocaf, Tabz, Grindz, Dezcal, Full Circle, and Rinza, with the correct dosing, frequency, and application method for each one.

What Is Urnex and Why Do Coffee Professionals Use It?

Urnex is a commercial-grade coffee equipment cleaning brand founded in 1936, originally supplying institutional coffee urn cleaners to commercial food service operations. The brand now produces the most widely used line of espresso machine backflush detergents, descalers, grinder cleaners, and milk system cleaners in specialty coffee.

Cafiza, Urnex’s flagship espresso machine cleaner, is used by Starbucks as their standard backflush detergent across all store locations globally. This single adoption fact tells you more about the product’s reliability than any review.

Urnex products are formulated specifically for coffee equipment, which matters because coffee oils are not ordinary kitchen grease. Coffee oils polymerize at brewing temperatures, forming a sticky, oxidized residue that standard dish soap cannot break down without leaving surfactant residue that directly contaminates shot flavor.

Urnex cleaners use sodium percarbonate and sodium carbonate as their active compounds. These compounds release active oxygen when dissolved in hot water, breaking the ester bonds in polymerized coffee oils at the chemical level rather than scrubbing them mechanically.

Complete Urnex Product Line: Every Cleaner and What It Does

Urnex produces seven distinct cleaning product categories, each targeting a specific type of residue in a specific part of the coffee equipment workflow. Using the wrong product for the job either fails to clean properly or risks damaging equipment seals and surfaces.

Use the table below to match your cleaning task to the correct Urnex product before purchasing.

Urnex Product	Primary Use	Active Ingredient	Format	Typical Dose	Rinse Required
Cafiza	Espresso machine backflush	Sodium percarbonate	Powder or tablet	1g powder or 1 tablet	Yes, 5 rinse cycles
Biocaf	Organic espresso backflush	Plant-based enzymes	Powder or tablet	1g powder or 1 tablet	Yes, 5 rinse cycles
Tabz	Drip brewer and urn cleaning	Sodium percarbonate blend	Tablet	1 tablet per brewer cycle	Yes, 2-3 rinse cycles
Grindz	Burr grinder cleaning	Food-grade cleaning grain	Tablet or pellets	35g pellets or 1 tablet	Grind stale beans after
Dezcal	Descaling boilers and brewers	Citric acid or lactic acid	Powder or tablet	125mL solution per cycle	Yes, 3 full rinse cycles
Full Circle	Organic descaling	Plant-derived citric acid	Powder	25g per 500mL water	Yes, 3 full rinse cycles
Rinza	Steam wand and milk system	Alkaline surfactant blend	Liquid	1 capful per 500mL water	Yes, flush thoroughly

Urnex also produces a specialty cleaning line for commercial batch brewers, cold brew equipment, and siphon brewers under the Urn and Brewer Cleaner and Clearly Coffee labels. For home use, the seven products above cover every cleaning scenario.

Urnex Cafiza: The Espresso Machine Backflush Detergent Standard

Cafiza removes polymerized coffee oils from espresso machine group heads, portafilters, baskets, and shower screens using sodium percarbonate activated by hot water. It is the single most important cleaning product for any espresso machine with a three-way solenoid valve that supports backflushing, including the Gaggia Classic Pro, Rancilio Silvia, and the full Breville Barista line.

The mechanism works because sodium percarbonate releases active oxygen when dissolved in water above 140°F (60°C). This oxygen breaks the ester bonds holding polymerized oils to metal surfaces, converting them into water-soluble compounds that flush away in the rinse cycles.

This reaction only occurs at adequate water temperature. Using Cafiza in cold water produces almost no cleaning effect, because the percarbonate does not fully activate below 120°F (49°C).

If you skip backflushing for more than one week of daily use, rancid oil buildup reaches the solenoid valve and can cause bitter flavors that persist even after descaling. Fix this by running three consecutive backflush cycles with 1g of Cafiza before your normal weekly cleaning cycle.

How to Backflush with Cafiza: Step-by-Step

The standard Cafiza backflush procedure for home espresso machines takes approximately 10 minutes and requires a blank portafilter basket (a solid disk with no holes, sometimes called a blind basket).

1. Remove the portafilter basket and insert the blank basket into the portafilter.
2. Add 1g of Cafiza powder directly into the blank basket (not into the grouphead).
3. Lock the portafilter into the group head as normal.
4. Run the pump for 10 seconds, then stop for 5 seconds. Repeat this 10-second on, 5-second off cycle five times.
5. Remove the portafilter and rinse it, the basket, and the shower screen under running water.
6. Lock the clean blank basket back in without any detergent and run five clean water cycles of 10 seconds each to flush residual Cafiza from the grouphead and solenoid.
7. Reinstall the brew basket, pull a shot, and discard it before brewing for consumption.

Key Specifications for Cafiza Powder Use:

• Dose: 1g per backflush cycle (home machines); 2g for commercial machines
• Water temperature required: minimum 140°F (60°C), ideal at full brew temperature
• Rinse cycles required: minimum 5 clean water cycles after detergent cycles
• Frequency: daily at cafes; weekly for home use (1-2 shots per day)
• Contact time per cycle: 10 seconds pressurized, 5 seconds rest

Cafiza is not safe for machines without a three-way solenoid valve, including most Moka pots and lever espresso machines without a bypass. Check your machine manual before backflushing.

Cafiza Tablets vs Cafiza Powder: Which to Use

Cafiza tablets contain 1.5g of compressed Cafiza powder per tablet, which is pre-measured and eliminates the need for a scale during backflushing. The powder form is more economical for daily commercial use and allows precise dose adjustment, but it requires a small measuring spoon.

For home baristas cleaning weekly, Cafiza tablets are more practical. For cafes running three or more backflushes per day, the 566g powder tin costs significantly less per dose than the tablet format.

Urnex Biocaf: The Organic Alternative to Cafiza

Biocaf performs the same backflushing function as Cafiza but uses plant-based enzymatic compounds instead of sodium percarbonate, making it USDA-certified organic and NSF/ANSI 60-certified safe for food equipment. Biocaf is the correct choice for operators who need certified organic cleaning documentation or who are sensitive to percarbonate compounds.

The enzymatic mechanism in Biocaf works by targeting the fatty acid chains in coffee oil molecules specifically. Lipase enzymes break down triglyceride-based coffee oils at the molecular level, which is a targeted action compared to the broad-spectrum oxidation approach of Cafiza.

Biocaf requires slightly longer contact time than Cafiza to achieve the same level of cleaning. Commercial operations using Biocaf typically extend the backflush cycle from 10 seconds to 15 seconds per cycle to account for the slower enzymatic action compared to percarbonate oxidation.

If your espresso tastes clean but you want to use certified organic cleaning products for documentation or personal preference, Urnex Biocaf tablets deliver equivalent cleaning results to Cafiza at the same cost per tablet.

Urnex Grindz: How to Clean a Coffee Grinder Without Disassembly

Grindz removes rancid coffee oils and stale coffee particles from burr grinders by running food-grade cleaning pellets through the grinding mechanism. The pellets absorb oils and abrade deposits from the burrs and grinding chamber walls without requiring burr removal or water.

This matters because coffee oils coat burr grinder surfaces in a layer that thickens with each use. According to Scott Rao’s “The Professional Barista’s Handbook,” retained coffee oil oxidation inside a grinder can add detectable rancidity to espresso within 48 hours of a heavy grinding session.

The mechanism works because the Grindz pellets are made from a food-safe grain and mineral compound that shatters into fine particles when ground, carrying oil-laden coffee fines out of the burr chamber with them. This happens because the pellet material has a slightly lower Mohs hardness than the steel or ceramic burr material, allowing it to clean without abrading the burrs themselves.

This cleaning action only works if you follow the pellets with a purge cycle of approximately 20-30g of stale coffee beans. The stale coffee purge removes any Grindz residue from the burr chamber before you brew for consumption.

If you skip the purge cycle, the first 3-5 shots after Grindz cleaning will carry a faint starchy off-flavor from residual pellet dust. Fix this by grinding and discarding 30g of inexpensive coffee after every Grindz session before returning to your regular beans.

How to Use Grindz in a Flat or Conical Burr Grinder

The Grindz procedure is the same for flat burr and conical burr grinders. The process takes approximately 5 minutes and requires no tools.

1. Empty the hopper completely. Grind out all remaining coffee before starting.
2. Pour 35g of Grindz pellets into the empty hopper (approximately one-third of a 430g bag).
3. Set the grinder to the grind setting you normally use for espresso or your primary brew method.
4. Run the grinder until all pellets have passed through.
5. Pour 30-40g of inexpensive whole bean coffee into the hopper and grind it completely as a purge cycle. Discard this coffee.
6. Repeat the purge with a second 30g of coffee if you have not cleaned the grinder in more than two weeks.

Key Specifications for Grindz Use:

• Dose: 35g (approximately one Grindz tablet) per cleaning session
• Frequency: every 2 weeks for daily home use; weekly for high-volume use
• Purge amount: 30g stale coffee after pellets, or 60g if cleaning interval exceeded two weeks
• Compatible grinder types: flat burr, conical burr, ceramic burr (not for blade grinders)
• Not compatible with: grinders without a hopper (single-dose loading directly into burrs)

For single-dose grinders without hoppers such as the Fellow Ode Gen 2 or the Niche Zero, Grindz pellets must be loaded directly into the bean intake in small batches of 5-10g rather than poured into a hopper at once.

Urnex Dezcal vs Full Circle: Choosing the Right Descaler

Dezcal and Full Circle both remove calcium carbonate and magnesium scale from boilers, heating elements, and internal water pathways. Dezcal uses an optimized lactic and citric acid blend. Full Circle uses plant-derived citric acid and is USDA Certified Biobased, making it the organic-certified option for operators who need that documentation.

Scale buildup is the primary cause of reduced boiler efficiency, temperature instability, and premature heating element failure in espresso machines. According to Urnex technical documentation, 1.5mm of scale on a heating element reduces thermal efficiency by approximately 12%, causing water temperature at the group head to drop below the target range of 195-205°F (90-96°C) even when the machine’s thermostat reads correctly.

The descaling mechanism works because citric and lactic acids react with calcium carbonate (the primary component of limescale) to form calcium citrate and calcium lactate. These compounds are water-soluble and flush out of the machine in the rinse cycles, while calcium carbonate in its original mineral form is not water-soluble.

This reaction only occurs when the descaling solution stays in contact with the scale for a minimum dwell time of 15-20 minutes. Running the descaler through the machine without pausing between cycles removes far less scale than the step-and-soak method described below.

If you skip descaling for more than three months in a hard water area (water hardness above 150 ppm), scale accumulation can reach a thickness that prevents full removal in a single descaling session, requiring two consecutive descaling treatments. Fix this by establishing a monthly descaling schedule for machines used daily in water above 100 ppm total dissolved solids.

How to Descale an Espresso Machine with Dezcal

The Dezcal descaling procedure varies slightly by machine type. The core process below applies to most single boiler and heat exchanger machines, including the Breville Barista Express, Gaggia Classic Pro, and De’Longhi La Specialista.

1. Empty and remove the water tank. Mix 125mL of Dezcal solution by dissolving one Dezcal sachet or 25g of Dezcal powder in 500mL of water at room temperature.
2. Pour the solution into the water tank and reinstall it.
3. Run approximately 100mL of solution through the group head, then stop the pump and let the machine sit for 15 minutes.
4. Run another 100mL through the steam wand (with the steam wand tip removed), then stop and wait another 10 minutes.
5. Run the remaining solution through the group head in one continuous cycle.
6. Empty the tank and refill with fresh, cold water.
7. Run three complete tanks of fresh water through the group head and steam wand to flush all descaler residue before brewing for consumption.

Key Specifications for Dezcal Use:

• Dose: 25g powder per 500mL water (5% solution by weight)
• Minimum dwell time: 15-20 minutes for the step-and-soak method
• Rinse cycles required: 3 complete fresh water tanks after descaling
• Frequency: monthly for hard water above 150 ppm; every 2-3 months for water below 100 ppm
• Not safe for: aluminum components (citric acid corrodes aluminum over repeated exposure)

Dezcal is not recommended for machines with aluminum boilers or aluminum heating elements. Check your machine’s manual to confirm boiler material before using any acid-based descaler. For aluminum-component machines, Urnex recommends their phosphoric acid-free descaling formula specifically.

How Often Should You Descale Based on Water Hardness?

Descaling frequency depends entirely on the hardness of your water supply, measured in parts per million (ppm) of dissolved calcium and magnesium. Soft water below 50 ppm requires descaling every 3-4 months. Water between 100-150 ppm requires monthly descaling. Water above 200 ppm requires descaling every 2-3 weeks for daily-use machines.

A TDS meter for water hardness testing costs $10-15 and gives you a precise ppm reading in 30 seconds. This single measurement determines whether you need monthly or quarterly descaling, which can save your boiler from premature failure caused by under-cleaning.

Using Third Wave Water mineral packets or a BWT Bestmax water filter reduces incoming hardness to approximately 50-70 ppm, which extends the safe descaling interval to every 2-3 months for daily-use home machines.

Urnex Rinza: Steam Wand and Milk System Cleaning

Rinza removes baked-on milk proteins and milk fat from steam wands, milk frother tubes, and automatic milk system components using an alkaline surfactant blend. It is the correct cleaning product for any milk-contact surface on an espresso machine, because milk residue chemistry is entirely different from coffee oil residue and requires alkaline rather than oxidizing chemistry.

Milk proteins denature and bond to stainless steel surfaces at temperatures above 140°F (60°C). This happens because the whey proteins in milk (primarily beta-lactoglobulin) undergo irreversible structural changes when heated and form covalent bonds with the metal oxide layer on stainless steel steam wand surfaces.

Rinza’s alkaline surfactant system breaks these protein bonds by raising the pH of the cleaning solution to approximately 11-12, which disrupts the peptide cross-links holding the denatured protein matrix together. This only works if the Rinza solution contacts the milk residue directly, which means soaking the steam wand tip in Rinza solution rather than simply wiping the outside.

If milk residue is left on the steam wand for more than 24 hours without cleaning, it fully polymerizes into a hard, waxy film that Rinza cannot remove in a standard 20-minute soak. Fix this by extending the soak to 60 minutes or using a pipe cleaner brush with Rinza solution to mechanically agitate the residue before soaking.

How to Use Rinza on a Steam Wand

1. Remove the steam wand tip by unscrewing it counterclockwise (most machines).
2. Mix Rinza solution at 1 capful (approximately 15mL) per 500mL of warm water, around 140°F (60°C).
3. Submerge the steam wand tip and the lower 10cm of the steam wand in the Rinza solution for 20 minutes.
4. For fully automatic machines with internal milk tubes, run 500mL of the Rinza solution through the milk system using the machine’s cleaning cycle function.
5. Rinse the steam wand tip thoroughly under running water for 30 seconds before reattaching.
6. Purge the steam wand for 5 seconds after reattachment to clear any Rinza solution from the internal tube before steaming milk for consumption.

Key Specifications for Rinza Use:

• Dose: 15mL Rinza per 500mL water (3% solution)
• Water temperature: 120-160°F (49-71°C) for best activation
• Soak time: 20 minutes standard; 60 minutes for old, hardened milk deposits
• Frequency: daily for machines used for milk drinks every day; after every milk session for commercial use
• Compatible with: stainless steel, brass, and food-grade silicone components

For daily milk drinkers, the fastest routine is to place the steam wand tip in a small cup of Rinza solution immediately after each milk session, let it soak while you drink your coffee, then rinse it before the next use. This prevents polymerization and eliminates the need for extended monthly soaks.

Urnex Tabz: Cleaning Drip Coffee Makers and Batch Brewers

Tabz are pre-measured effervescent tablets designed for cleaning drip coffee makers, percolators, airpots, and commercial batch brewers. Each tablet dissolves in water at brewing temperature to produce a sodium percarbonate cleaning solution that removes coffee oils, tannins, and mineral deposits from all water-contact surfaces in one pass.

The key advantage of Tabz over powder cleaners for drip machines is that the tablet format prevents overdosing, which is the most common cause of cleaning solution residue in drip brewers. Too much cleaning chemical leaves a soapy aftertaste that takes three or more rinse cycles to fully remove.

For standard home drip coffee makers such as the Bonavita 8-cup drip brewer, one Tabz tablet in the water reservoir with one full brew cycle, followed by two plain water rinse cycles, is the complete cleaning procedure. Clean monthly for daily use machines.

Tabz is also the correct product for cleaning Chemex brewers, French press carafes, and other manual brewing vessels that cannot be backflushed. Fill the vessel with hot water, add one Tabz tablet, let it dissolve and soak for 15 minutes, then rinse thoroughly.

Cleaning Schedule: How Often to Use Each Urnex Product

Cleaning frequency is the factor most often miscalibrated by home baristas. Under-cleaning allows oil and scale buildup that degrades shot quality progressively, so gradually that most people blame their beans rather than their equipment. Over-cleaning with descalers risks seal damage and component corrosion over time.

Use the table below to set the correct cleaning frequency for each Urnex product based on your daily usage volume.

Urnex Product	Light Home Use (1-2 shots/day)	Medium Home Use (3-5 shots/day)	Heavy Home/Prosumer Use (6-10 shots/day)	Commercial Use (50+ shots/day)
Cafiza backflush	Weekly	Every 3 days	Every other day	Daily (every shift)
Grindz grinder clean	Monthly	Every 2 weeks	Weekly	Weekly
Dezcal descale	Every 2-3 months (soft water); Monthly (hard water)	Monthly (soft water); Every 3 weeks (hard water)	Every 3 weeks	Every 2 weeks (filtered water only recommended)
Rinza steam wand	After each milk session	After each milk session	After each milk session	After each milk session; deep clean weekly
Tabz drip brewer	Monthly	Every 2 weeks	Weekly	Daily

The most reliable trigger for Cafiza backflushing is flavor, not the calendar. When espresso starts tasting bitter or muted at a grind and dose that previously produced balanced shots, the grouphead needs cleaning. Clean it immediately rather than waiting for the scheduled cleaning day.

Here is a step-by-step guide to keeping your full espresso machine setup clean and performing at its best, with Cafiza, Dezcal, and Rinza each applied at the right moment in the weekly routine.

Cafiza vs Puly Caff vs Home Cleaning Tablets: How Urnex Compares

Cafiza is not the only espresso machine backflush detergent on the market. Puly Caff (made by PulyCaff, Italy) and generic OEM cleaning tablets are the two most common alternatives. Understanding the chemistry differences between these products prevents cleaning failures from using the wrong product.

Use the table below to compare active ingredients, cleaning strength, and compatibility across the most common backflush detergents available to home baristas.

Product	Active Ingredient	Cleaning Mechanism	Organic Certified	Price per Dose (approx.)	Best For
Urnex Cafiza Powder	Sodium percarbonate	Active oxygen oxidation	No	$0.08-0.12 per dose	Daily commercial and weekly home use
Urnex Cafiza Tablets	Sodium percarbonate (compressed)	Active oxygen oxidation	No	$0.30-0.45 per tablet	Weekly home use (pre-measured)
Urnex Biocaf Tablets	Plant-based enzymes	Enzymatic lipid breakdown	Yes (USDA Organic)	$0.35-0.50 per tablet	Organic-certified operations
Puly Caff Plus Powder	Sodium percarbonate	Active oxygen oxidation	No	$0.10-0.15 per dose	European espresso machines; Italian brand preference
OEM Machine Tablets (Breville, De’Longhi)	Varies by brand	Oxidation or enzymatic	No	$0.80-1.50 per tablet	Warranty compliance; machines with cleaning lock features
Generic Percarbonate Tablets	Sodium percarbonate (variable purity)	Active oxygen oxidation	No	$0.05-0.10 per tablet	Not recommended; purity and filler content uncontrolled

Cafiza and Puly Caff use the same primary active ingredient and produce equivalent cleaning results at the same concentration and contact time. The choice between them is a matter of brand preference and price per dose, not chemistry. Both are superior to generic percarbonate tablets because food-grade manufacturing controls ensure consistent purity and particle size distribution that affects dissolve rate.

Is Urnex Safe for All Espresso Machines? Compatibility and Safety Guide

Urnex cleaning products are safe for all stainless steel, brass, and food-grade plastic components inside espresso machines when used at the correct dose and rinsed thoroughly. Compatibility problems arise from three specific situations: wrong product choice for machine type, exceeding the recommended dose, and inadequate rinsing.

Cafiza and Biocaf are safe for all machines with a three-way solenoid valve and a blank basket. They are not safe for use in machines without backflush capability, because the detergent cannot be flushed out through the standard rinse cycle in machines without a solenoid bypass.

Dezcal and Full Circle descalers are not compatible with aluminum internal components. Citric and lactic acids corrode aluminum over repeated exposure. Most modern espresso machines use stainless or brass boilers and are Dezcal-compatible, but older machines and some budget superautomatic machines use aluminum heating elements. Check your machine manual before descaling.

Grindz is not suitable for blade grinders, because the pellets require the even pressure of two burr surfaces to fracture into cleaning particles. In a blade grinder, Grindz pellets spin at high speed and impact the blades as intact hard pellets, which risks chipping blade edges. Use a burr grinder cleaning brush for blade grinders instead.

Rinza is safe for all stainless steel steam wands and food-grade silicone components. It is not recommended for brass steam wand components that are left uncoated, because the alkaline pH of Rinza can cause surface oxidation on bare brass over prolonged contact above 30 minutes. Rinse brass components within 20 minutes of Rinza contact.

Where to Buy Urnex Cleaners: Formats and Pack Sizes

Urnex products are available in multiple pack sizes calibrated for different use levels. Home baristas purchasing for the first time often buy small packs that expire before they are used, while daily users sometimes buy large commercial packs that are more economical but awkward to store.

Cafiza powder is available in a 566g tin that yields approximately 566 home-use doses at 1g per backflush. For a home barista cleaning weekly, this tin lasts approximately 10 years. The 100-tablet box is more practical for home use, providing about 2 years of weekly cleaning at a slightly higher cost per dose.

Dezcal powder is available in 100g sachets (4 descaling sessions), 454g tins (approximately 18 sessions), and individual descaling packets. For most home users, the individual sachets are most convenient because they store easily and provide a fresh, pre-measured dose without opening a large container repeatedly.

Grindz is available in a 430g bottle (approximately 12 cleaning sessions at 35g per session) and individual 35g tablets. The bottle is more economical for regular use. Buy the Urnex Grindz 430g bottle if you clean monthly or more frequently, and the individual tablets if you clean quarterly.

Rinza is available as a 1L bottle and in 500mL format. At 15mL per cleaning session, a 1L bottle provides approximately 66 steam wand cleaning sessions. For daily milk drinkers, one 1L bottle lasts about 3 months.

Understanding the full range of equipment that benefits from regular cleaning, including your grinder and brewing accessories, is covered in our comprehensive overview of coffee equipment maintenance and brewing fundamentals.

Common Urnex Cleaning Mistakes and How to Fix Them

The most common Urnex cleaning mistake is insufficient rinsing after backflushing. Cafiza has a distinct soapy, slightly chemical taste that carries through into espresso if even a small amount of residue remains in the grouphead after cleaning. This flavor is often blamed on the coffee beans or grinder when the actual cause is a backflush cycle with only 2-3 rinse cycles instead of the required 5.

The second most common mistake is using Dezcal too frequently in soft water areas. Monthly descaling of a machine used with water below 50 ppm hardness exposes boiler seals and o-rings to acid more often than necessary, which can accelerate seal degradation over 2-3 years of over-cleaning. Match descaling frequency to actual water hardness, not to a fixed calendar schedule.

A third frequent error is using Cafiza to clean drip coffee makers by running it through the brew cycle without a blank basket. Cafiza requires the pressurized backflush cycle to work correctly. For drip machines, Tabz is the correct product, because it is formulated for atmospheric-pressure brewing contact time rather than the pressurized contact of espresso backflushing.

Many home baristas also skip the discard shot after backflushing because it wastes coffee. The discard shot is not optional. Cafiza residue in the final millimeter of the dispersion screen is enough to add a chemical bitterness to the first shot pulled after cleaning, even after 5 clean rinse cycles. Pull it and discard it every time.

To understand how equipment cleanliness interacts with grind size, water temperature, and extraction variables when troubleshooting espresso flavor problems, our guide on selecting and maintaining home espresso machines for consistent shot quality covers the full diagnostic process.

Frequently Asked Questions About Urnex Cleaner

Can I use Cafiza in a machine that does not have a three-way solenoid valve?

Cafiza backflush cleaning requires a three-way solenoid valve to work correctly. The solenoid creates the pressure differential needed to push the detergent solution back through the grouphead seal and out the drain tube, which is how the cleaning action reaches the shower screen, dispersion screen, and internal passages. Machines without a solenoid, including most lever espresso machines and all Moka pots, cannot backflush.

For machines without a solenoid valve, soak the portafilter, basket, and shower screen in a Cafiza solution of 2-3g dissolved in 500mL hot water for 20-30 minutes, then rinse thoroughly. This does not clean the internal grouphead passages but does remove the most accessible oil deposits from removable components.

Is Urnex Cafiza food-safe after rinsing?

Cafiza is NSF-certified (NSF/ANSI Standard 61) for use in food service equipment and breaks down into sodium carbonate, water, and oxygen after activation. After the required 5 rinse cycles, no detectable Cafiza residue remains in a properly rinsed machine. Sodium carbonate itself (the post-activation form) is a common food additive (E500) used as a pH regulator and is considered safe by the FDA at trace levels.

The key word is “after rinsing.” Cafiza solution at cleaning concentration (1g per cycle) has an alkaline pH of approximately 10-11, which will taste soapy and chemically bitter if residue remains. Always complete all 5 rinse cycles and pull a discard shot before brewing for consumption.

What is the difference between Cafiza and Dezcal, and can I use one instead of the other?

Cafiza removes coffee oils and organic residue using sodium percarbonate oxidation. Dezcal removes calcium carbonate mineral scale using citric and lactic acid. These two products target completely different types of residue and cannot substitute for each other. Using Cafiza in place of Dezcal will not remove scale. Using Dezcal in place of Cafiza will not remove coffee oils.

A machine that needs both cleaning and descaling requires both products, applied in the correct sequence. Backflush with Cafiza first to remove oils, then descale with Dezcal in a separate session. Running Dezcal through a heavily oiled machine is less effective because the oil layer partially insulates the scale from the acid solution.

Why does my espresso still taste bitter after backflushing with Cafiza?

Bitter taste after a Cafiza backflush almost always means one of two things: inadequate rinsing or a grind and extraction problem that existed before cleaning. If the bitterness has a soapy, chemical quality, it is Cafiza residue from insufficient rinsing. Run 5 more clean water backflush cycles immediately, pull a discard shot, and taste again.

If the bitterness tastes like coffee rather than chemicals, the extraction parameters need adjustment. Cleaning does not fix over-extraction caused by grind that is too fine, dose that is too high, or water temperature above 205°F (96°C). Clean equipment extracts coffee more efficiently than dirty equipment, so a clean machine sometimes over-extracts a grind setting that previously tasted balanced on dirty equipment. Adjust grind coarser by 1-2 settings after cleaning.

How long does a Grindz cleaning session affect grinder flavor?

With the correct purge procedure, Grindz cleaning does not affect grinder flavor at all by the time the second purge cycle of 30g stale coffee is complete. The purge coffee picks up residual Grindz dust from the burr chamber and carries it out. The first 2-3 shots after the purge may have a very faint starchy quality at less than 1% of the total flavor profile, which is below the threshold of detection for most palates.

Without the purge cycle, the first 5-8 shots after Grindz cleaning taste noticeably starchy and slightly chalky. This is caused by fine Grindz particle dust that settles on the burrs and in the chute after grinding the pellets. Always purge with at least 30g of inexpensive coffee after every Grindz session.

Can Rinza be used to clean a superautomatic machine’s internal milk carafe?

Rinza is compatible with most superautomatic machine milk systems including those found in the De’Longhi Dinamica, Jura E8, and Philips 3200 series. Use the machine’s dedicated cleaning cycle function with a Rinza solution of 15mL per 500mL water. Do not exceed the 3% concentration, because higher concentrations can leave residue on the internal tubing that is difficult to flush fully.

For superautomatic machines with dedicated cleaning tablets supplied by the manufacturer (Jura Claris tablets, for example), check whether the warranty requires using only the OEM cleaning product. Some manufacturers void the warranty if non-OEM cleaning chemicals are used, even if the third-party product is chemically equivalent or superior.

Does the frequency of Cafiza backflushing depend on the roast level of coffee I use?

Darker roasts produce more coffee oil per gram of coffee than lighter roasts. A machine used exclusively for dark roast espresso at 18-19g doses accumulates oils approximately 30-40% faster than a machine used for light or medium roast at the same dose. The practical effect is that dark roast users should backflush every 5 days rather than every 7 days, and should check the shower screen visually for brown oil deposits as an additional trigger.

Light roast espresso produces less oil but produces more fines from the higher-density bean structure. These fines pack into the dispersion screen more readily than the oils from dark roasts. Visually inspect and rinse the shower screen daily when using light roast beans ground espresso-fine (200-300 microns).

Is it safe to descale with Dezcal while the espresso machine is under warranty?

Most espresso machine manufacturers explicitly endorse or approve Dezcal and Urnex products in their warranty documentation. Breville, Gaggia, Rancilio, and La Marzocco all approve the use of third-party descalers meeting NSF standards, which Dezcal satisfies. De’Longhi and Jura prefer their own descaling tablets but generally do not void warranties for NSF-certified third-party descalers used at the correct concentration.

The warranty risk comes from descaling aluminum-component machines with acid-based descalers, not from using Dezcal on stainless and brass machines. If your machine documentation warns against citric acid descalers, contact Urnex directly, as they produce a non-citric descaling formula for aluminum-component equipment.

Can I use Urnex Tabz to clean a French press or pour over equipment?

Tabz is fully safe and effective for cleaning French press carafes, Chemex brewers, Hario V60 drippers, AeroPress chambers, and other non-pressurized coffee brewing equipment. Fill the vessel with hot water, drop in one Tabz tablet, allow it to dissolve fully (approximately 3-4 minutes), and let the solution soak for 15-20 minutes.

Rinse the vessel 2-3 times with clean hot water after the soak. Tabz is also the fastest way to clean coffee-stained glass carafes and thermal carafe interiors where a bottle brush cannot reach all surfaces. The effervescent action lifts oil and tannin deposits from vertical surfaces that contact-based scrubbing misses.

What is the shelf life of Urnex cleaning products?

Cafiza and Dezcal powder have a shelf life of approximately 2-3 years when stored in a sealed container in a cool, dry location. Sodium percarbonate degrades by releasing its oxygen prematurely when exposed to humidity, heat, or light. A Cafiza powder that fails to produce visible fizzing when mixed with hot water has lost significant active oxygen and will not clean effectively.

Tablets are more shelf-stable than powder because the compressed format limits moisture absorption. Cafiza tablets stored in their original sealed packaging remain effective for 3-4 years. Rinza liquid is stable for approximately 2 years unopened and 12-18 months after opening. Store all Urnex products below 77°F (25°C) away from direct sunlight.

Why does Dezcal leave a faint acidic smell after rinsing?

The faint acidic smell after Dezcal descaling is residual citric acid vapor from heating elements that reached cleaning temperature during the descaling session. This is harmless and dissipates completely after the 3-cycle fresh water rinse and one normal pre-heat cycle. If the smell persists after 3 rinse cycles, run a fourth fresh water tank through both the group head and steam wand.

A persistent acidic smell after four rinse cycles indicates that the descaling solution contacted heating elements that were at full brewing temperature during the soak phase, which can bake a thin citric acid film onto the element surface. This is prevented by running Dezcal on a machine that has been allowed to cool to below 140°F (60°C) before starting the descaling procedure.

Can I use Cafiza to clean a drip coffee grinder that is not a burr grinder?

Cafiza is not designed for grinder cleaning of any type, including blade grinders. It is a water-activated chemical cleaner that requires both water and a pressurized rinse cycle to work and be fully removed. Introducing Cafiza into a blade grinder where water cannot be run through to rinse it creates a chemical residue that contaminates every grind session until the grinder is disassembled and manually cleaned.

For blade grinders, the only safe cleaning method is dry brushing with a small grinder cleaning brush, followed by grinding a small amount of white rice or specialized blade grinder cleaning tablets that do not use chemical activation. Grindz is safe only for burr grinders with a through-feed grinding channel.

If you are looking to upgrade from a blade grinder to a burr grinder for better espresso and cleaner flavor, our guide on choosing the right coffee maker and grinding equipment for your brewing method covers how grinder type affects extraction and what to look for at each price point.

Urnex Cleaning Products and Your Overall Coffee Quality

Clean equipment extracts coffee more consistently than dirty equipment because oil and scale buildup changes the thermal properties, flow resistance, and surface chemistry of every water-contact surface in the brewing path. A monthly cleaning routine using Cafiza, Dezcal, Grindz, and Rinza in the correct sequence costs under $5 per month for a home barista and prevents the flavor degradation that most home espresso drinkers mistakenly attribute to stale beans or a tired grinder.

The highest-impact single change for most home espresso setups is consistent weekly Cafiza backflushing. For filter coffee drinkers, it is monthly Tabz cleaning of the brew basket and thermal carafe.

For a broader understanding of how water quality, grind settings, and bean freshness interact with equipment cleanliness to produce the best possible cup, our guide on the key variables that control coffee flavor from water to cup covers the complete brewing quality framework. Selecting the right freshly roasted coffee beans matched to your brewing method compounds every cleaning and maintenance improvement you make to your equipment.