Ask the Experts: Which Machines Need to be Backflushed?
Cleaning and maintenance is a hot topic in this neck o' the woods, but some folks aren't clear on which specific maintenance routines apply to the type of machine they own. This comes up specifically in regard to backflushing -- do you or don't you?
You do backflush if you own a machine with a valve system referred to as a three-way solenoid, brew pressure release, three-way valve, solenoid valve or any other combination of these phrases. Not sure if your machine has this? If your machine has an E61 brew group (such as those on Rockets, Quick Mills, Izzos or Grimacs), it has this valve system. Other models that feature this without the E61 are those made by La Spaziale, Pasquini, the Rancilio Silvia and Ascaso's Uno Pro and Duo series. This valve system relieves pressure post-brew, which results in a drier puck, but it sucks a little bit of coffee and water into the system each time which can build up in there and adversely impact the machine's performance. Backflushing forces detergent and water through the valve system, thoroughly cleaning it and maintaining the system. It also has the added benefit of cleaning up behind the brew head's screen without taking it apart.
You don't backflush if your machine doesn't have this system -- because you don't have the valves to clean! Some machines that don't need backflushing include the Saeco Aroma, Via Venezia, Sirena, models made by Breville, those from Francis Francis/illy and Delonghi and Capresso semi-automatics. But since you're not forcing detergent through the brew head, you will need to take it apart semi-regularly to clean up behind the brew screen.
The best way to determine if you need to backflush your machine is to read the manufacturer's manual and the machine's technical specifications to see if it has the valve system. If it doesn't, you're good to go; if it does, you should backflush once every 1 - 2 weeks, depending on how often you use the machine.
Not sure how to do it? Watch us backflush the Rocket Giotto E61 or the Rancilio Silvia.