How to Backflush Your Espresso Machine

Backflushing clears built-up coffee oils from the group head and valve. Here is how to do it safely — and which machines can.

What backflushing does (and which machines can)

Backflushing forces water back through the group head to flush out coffee oils and residue. It only works on machines with a 3-way solenoid valve (most E61 prosumer machines, the Gaggia Classic, and many others). Machines without a 3-way valve — including most all-in-one Brevilles — cannot be backflushed; check your manual before trying.

Water vs detergent

• Water-only backflush — a quick routine rinse you can do often
• Detergent backflush — espresso-machine cleaning powder for a deep clean of oils, about weekly

Step by step (detergent backflush)

1. Insert the blind (blank) basket into your portafilter.
2. Add a measured dose of espresso machine cleaning detergent to the blind basket.
3. Lock in and run the pump ~10 seconds, then stop ~10 seconds; repeat for several cycles.
4. Remove the portafilter and thoroughly rinse the blind basket and portafilter.
5. Run several water-only backflushes to clear all detergent, then pull and discard one shot before making coffee.

How often & cautions

• Water flush: after busy sessions
• Detergent backflush: roughly weekly with regular use
• Only on machines with a 3-way valve — never force it otherwise
• Use proper espresso-machine cleaner only; never harsh household chemicals

Watch it done

▶ Watch video tutorials on YouTube

FAQ

Recommended gear

Putting this into practice? Browse our espresso machine reviews and grinder reviews — or start with the Breville Barista Express, our pick for most home baristas.