How to backflush an espresso machine with detergent
A detergent backflush dissolves the coffee oils that water alone leaves behind. Done at the right cadence it keeps shots tasting clean; done too often on an E61 group it strips lubrication and wears gaskets, so frequency matters as much as technique.
What you need
- Blind filter
- Cafiza or similar detergent
How to do it
- Insert a blind filter into your portafilter
- Add up to 3g (½ teaspoon) of Cafiza or similar detergent
- Lock the portafilter into the group
- Activate brew for 10s, stop 10s, repeat 5 times
- Remove portafilter and rinse under running water
- Reinsert without detergent and run 5 more cycles of 10s on/off
- Pull one blank shot to flush out any residue
Tips from the bench
Collected from manufacturer guidance and years of home-barista forum wisdom:
- Dose small: about 3 g (half a teaspoon) is enough. A heavier scoop does not clean better, it just leaves more to rinse and risks soapy-tasting shots.
- The rinse is the step everyone cuts short. Five to ten plain-water cycles, until the water is completely clear, then a couple more.
- Espresso detergent only. Never dish soap, never vinegar, and never descaler through the group: descaler is an acid meant for the boiler and it attacks the group seal.
- Sacrifice the first shot after a detergent backflush. Trace residue ruins it anyway, and it rinses the last of the cleaner out.
Use only espresso-specific detergent. On E61 machines, no more than every 6 weeks; more often damages the gaskets.
How often?
Recommended cadence by machine type, from the maintenance data behind the Espremo app:
| Machine type | Frequency |
|---|---|
| E61 HX | Every 6 weeks |
| E61 Dual Boiler | Every 6 weeks |
| Non-E61 Dual Boiler | Every 2 weeks |
| Single Boiler | Monthly |
Machines that run their own cleaning cycle (like the Breville Oracle series) handle some of this automatically — cadence also shifts with water hardness and daily shot volume.
Never miss this task again
Espremo is a free iPhone app that builds a maintenance schedule for your exact machine — covering 108 models — and taps you on the shoulder when something is due.
Download on the App Store