Backflushing gets so much attention in espresso cleaning guides that it's easy to assume every machine needs it. Plenty of great machines can't backflush at all, and that's by design, not a shortcut.
The trade-off is that coffee oils behind the shower screen don't get flushed out automatically, so a little hands-on cleaning takes its place. We'll show you how to tell which kind of machine you have and the routine that keeps it tasting like it did on day one.
In This Article
Why Some Machines Can't Backflush
Backflushing cleans a specific part: the three-way solenoid valve. On machines that have one, the valve opens after each shot to release pressure from above the puck into the drip tray. A little coffee and water gets pulled into that valve path every time, and backflushing with a blind basket and detergent forces cleaner through it to clear the buildup.
Machines without a three-way valve don't have that path to clean. There's simply no valve system there, so backflushing doesn't apply, and the cleaning that backflushing would do behind the shower screen has to happen by hand instead.
Don't backflush a machine without a three-way valve. With no valve to release it, a blind basket just traps hot, pressurized water against the group. It won't clean anything, it can put stress on the machine, and you can get a spray of hot water and grounds when you unlock the portafilter. Use the routine below instead.
How to Tell Which Kind You Have
Your manual is the quickest answer. It will either include backflushing instructions or tell you not to backflush.
A few clues help too. Machines with a three-way valve send a burst of water into the drip tray right after you stop a shot, and they leave a fairly dry, firm puck. Machines without one usually leave a wetter, soupier puck, and you'll want to wait a few seconds before unlocking the portafilter. Machines with an E61 group always have the valve. A blind basket in the box is a strong hint, too, though it's not a guarantee.
Machines with the valve should follow our guide on how to backflush your espresso machine instead of this one.
Daily: Rinse, Wipe, and Purge
A few seconds after each session saves you a lot of scrubbing later.
Knock out the puck and rinse the portafilter and basket with hot water. Run a short flush of water through the group with the portafilter out to rinse loose grounds off the shower screen. Then wipe the screen and the gasket area with a damp cloth, since coffee grounds love to collect on that rubber edge and keep the portafilter from sealing well.
Purge and wipe the steam wand right after every use, too. Milk dries fast and is much harder to remove once it's baked on.
Weekly: Brush the Group and Soak the Basket
Once a week, or more often for heavy use, give the group and the portafilter a deeper clean.
With the machine on, use a group head brush to scrub around the gasket and across the shower screen while running short bursts of water. This loosens grounds and oils the daily wipe misses.
Then soak the basket and the metal portafilter head in a solution of Cafiza and hot water, following the package directions. Keep plastic or wooden handles out of the solution. Rinse everything thoroughly before your next shot. Our guide to cleaning your portafilter and baskets has the full process.
Every Few Weeks: Pull the Shower Screen
This is the step that replaces backflushing. Without detergent flowing behind the shower screen, coffee oils build up there over time, and the only way to reach them is to take the screen off. Our team recommends doing this semi-regularly on any machine that doesn't backflush. Every few weeks is a good starting point, adjusted for how much you use the machine and what your manual suggests.
Work on a cool machine. Turn the machine off, unplug it, and let the group cool completely before removing anything. The group and screen stay hot well after the power is off.
On most machines a single screw in the center holds the shower screen, and sometimes a dispersion plate behind it. Remove the screw, catch the screen as it comes free, and note the order of any parts. Soak the screen and plate in a Cafiza solution to dissolve the oils, then scrub and rinse them well.
While the screen is off, wipe the face of the group and brush any residue from the gasket channel. Reassemble in the same order, snug the screw without overtightening it, and run water through the group before brewing.
This is also a great time to look at the gasket. Our guide to replacing your group gasket and shower screen explains the signs that it's due.
Built-In Cleaning Programs
Some machines without a three-way valve include their own cleaning program, often with a specific cleaning disc or tablet. These cycles are designed around that machine's internals, so follow the manual exactly and use the products it calls for. A built-in program can take care of some of the routine above, but it won't usually replace pulling the shower screen now and then.
Don't Forget the Steam Wand
The steam wand needs the same attention on every machine. Beyond the daily purge and wipe, soak the tip regularly in Rinza to break down milk residue inside the wand. A blocked steam tip is one of the most common reasons for weak steaming. Our guide to cleaning your steam wand covers it step by step.
Descaling Still Applies
Cleaning removes coffee oils and milk. Descaling removes mineral buildup from the water. Every espresso machine needs both, whether or not it can backflush.
How often you descale depends on your water and your machine, so follow the interval in your manual. A descaler made for espresso machines, like Dezcal liquid, is easier to rinse out than vinegar. Our guide to descaling your espresso machine walks through the process, and which coffee cleaner do you need? sorts out which product does what.
Put it all together and your routine is short: rinse daily, brush and soak weekly, pull the screen every few weeks, and descale on schedule. Our espresso machine maintenance schedule puts it all on one page.
Frequently Asked Questions
Can I backflush an espresso machine without a three-way valve?
No. There's no valve for the water to exit through, so backflushing won't clean anything and can spray hot water when you remove the portafilter. Clean the group by hand instead.
How do I know if my espresso machine can backflush?
Check your manual first. Machines with a three-way valve release a burst of water into the drip tray after each shot and leave a drier puck. E61 group machines always have one.
How often should I remove the shower screen?
Every few weeks is a good starting point for machines that don't backflush, more often with heavy use. Follow your manual if it gives a specific interval.
What should I soak my shower screen in?
An espresso machine cleaner like Cafiza, mixed with hot water according to the package directions. Rinse everything thoroughly before reassembling.
Do I still need to descale a machine that can't backflush?
Yes. Backflushing and descaling handle different problems. Descaling removes mineral buildup, and every espresso machine needs it on the schedule in its manual.
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