How to Clean Your Espresso Machine with Cafiza
Cafiza is a sodium-based cleaner that strips coffee oils and residue out of your group head, portafilter, and backflush chamber. It’s the closest thing home baristas get to what I used behind the bar every single night. Pull two or more shots a day? Backflush with Cafiza once a week and you’ll stop that rancid, ashy taste before it ever starts.
What Cafiza Actually Does
Espresso oils go rancid fast. Coffee is roughly 15% oil by weight, and those oils cling to gaskets, screens, and the inside of your group head. Cafiza is a powdered alkaline cleaner. It breaks down those oils chemically instead of just rinsing them with hot water, which is all a plain flush does. Six years behind a bar taught me that hot water alone just relocates the gunk. Cafiza actually removes it.
Urnex, the company that makes Cafiza, built it specifically for backflushing blind portafilter baskets. Don’t confuse it with descaler — Cafiza handles organic buildup (coffee oil), descaler handles mineral scale. You need both, on different schedules, for different reasons.
What You’ll Need
- Cafiza powder or tablets
- A blind (blank) portafilter basket — no holes
- A small brush or old toothbrush for the group head gasket
- A cloth or paper towel
- Warm water
Step-by-Step: Backflushing with Cafiza
- Insert the blind basket into your portafilter. This traps water and cleaner so it forces backward through the group head’s solenoid valve instead of dripping into your cup.
- Add ¾ teaspoon of Cafiza powder (or one tablet) into the blind basket.
- Lock the portafilter into the group head and run the pump for 10 seconds, then stop for 10 seconds. Repeat five to eight times. You’ll see dark, oily water pushing up into the drip tray or shower screen. That’s the buildup coming loose.
- Remove the portafilter, rinse the basket, then repeat the same 10-on, 10-off cycle three to five more times with plain water only. No cleaner left behind — Cafiza is safe when rinsed properly, but nobody wants soap in their espresso.
- Pull a shot and discard it. Always. This clears any last trace of cleaner from the lines.
- Soak your portafilter basket and shower screen separately in one tablespoon Cafiza per liter of hot water for 15-20 minutes, then scrub with your brush and rinse thoroughly.
The Real Bottleneck
People obsess over backflushing frequency and ignore the gasket and shower screen. That’s where I find the worst gunk, every time. The group head gasket sits right under the screen and traps a ring of old coffee oil that no amount of backflushing touches, because the water never contacts it directly during a flush cycle. Pull your shower screen and screw at least once a week and scrub the gasket seat with your brush. That’s the step that actually changes how your shots taste. Not the flush count.
How Often Should You Actually Do This?
| Usage Level | Backflush with Cafiza | Basket/Screen Soak |
|---|---|---|
| 1 shot per day | Weekly | Every 2 weeks |
| 2-4 shots per day | 2-3x per week | Weekly |
| Commercial/high volume | Daily | 2-3x per week |
The Specialty Coffee Association doesn’t publish a hard rule on cleaning frequency — that’s maintenance, not a brewing standard. But their extraction guidelines assume clean equipment as a baseline. Every extraction number you’re chasing — 18g in, 36g out, 25-30 seconds — gets skewed by rancid oil coating your basket. Old oil changes flow rate and adds bitterness that has nothing to do with your grind setting.
A Mistake I See Constantly
People run Cafiza through the group head and think they’re done. They’re not. If you’ve got a Baratza grinder on your counter, you already know the drill from cleaning burrs: buildup hides in the parts you don’t look at. Same logic here. The grinder cleaning brush I use for burr maintenance works just as well on gasket grooves and screen threads on the espresso side. One brush, two jobs.
Check your machine’s manual before you start. Some prosumer machines — certain Rancilio and ECM models — have solenoid valve designs that don’t tolerate aggressive backflushing the way commercial three-group machines do. When in doubt, run fewer, gentler cycles and rinse longer. Force dirty water backward too aggressively on a machine not built for it, and you’ll push residue into places a brush can’t reach.
Don’t Skip the Rinse
This is where people get lazy. Cafiza residue left in your lines tastes soapy and metallic. I’ve had readers email me convinced their machine was broken when it was just under-rinsed. Three flush cycles minimum with plain water, then a discarded shot. Still smell anything faintly chemical after that? Run one more cycle. Costs you thirty seconds.
Weighing Your Cleaner (Yes, Really)
I know it sounds obsessive, but I weigh my Cafiza dose on a gram scale instead of eyeballing teaspoons, especially with powder that clumps in humid kitchens. Too little and you’re not breaking down oil. Too much and you’re fighting extra rinse cycles for nothing. 3-4 grams per backflush cycle is what I’ve settled on after testing it against Urnex’s own package guidance for months.
Add the gasket and screen to your routine. Weigh the cleaner instead of guessing. Rinse until the water runs clear. What’s sitting under your sink right now is already enough — you don’t need anything fancier than that.
— Nora Voss, Home Barista & Coffee Equipment Reviewer
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