I've noticed I all of a sudden have a small amount of water on top of my spent portafilter puck. My Gaggia Classic is only 3-1/2 years old. I draw 3-4 double shots a day. I have descaled the boiler and back flushed the system through the solenoid valve. It continues to produce perfect shots of espresso with thick creama perfecta. My draw is still 25-30 seconds, same grind, same tamp, same beans, nothing changed just a couple mm of water standing on top of the spent puck. I'm not super concerned just curious if anyone else has experienced this?
Hmm, you do regularly backflush using a cleaner like Cafiza? When you do, if there a good healthy blast of soapy water through the 3-way valve? If so, I don't know why water under pressure would not go the same route. If not, I'd guess that is your problem area.
Happens in my Gaggia when I drop the dose to 12g or so. Never at 14-15g.
EDIT: Just remembered that this was happening from time to time just before changing burrs on one of my grinders. I think the grind was getting sloppy on the old burrs, too many chunks and fines. How many pounds have gone thru your grinder?
I didn't think about dosing quantity. I grind about 3 lbs a month. 3-1/2 years x 3 = about 125 lbs would be a good guess. I'll check the burrs.
I do a back flush once a week or so... water only I've done the cleaner maybe once every six months. I get a fairly good splash out of the downspout when I turn off pump while making espresso. The splash is substantial when I use the rubber membrane, everything appears to be working correctly. I'll round up some cleaner/detergent (I might have sometime hung up).
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