This worries people more than it should, and the first thing to establish is what machine you have.
If your machine has no three-way solenoid
A wet puck is completely normal and tells you nothing.
When a shot ends, water is still under pressure above the coffee. A three-way solenoid vents that pressure out through a drain, leaving a firm, dry puck. A machine without one has nowhere to send it, so the water sits on top of the coffee and soaks in. Many thermoblock machines, such as the De’Longhi Dedica, and many super-automatic units work this way.
Ignore it. Knock the puck out and get on with your day.
If your machine does have one
A Gaggia Classic, a Lelit, most prosumer machines: here a dry, firm puck is the norm and a soupy one is a signal.
Dose too low. This is the usual answer. Space above the puck fills with water that has nowhere to go. Weigh the dose and fill the basket to its rating.
Basket and dose mismatched. An 18 g basket with 14 g in it will always be wet. Match the dose to the basket, not to a number you read somewhere.
Solenoid sticking. Rarer, and worth suspecting if the puck used to be dry and has become wet with no other change. It is a serviceable part.
Checking the dose
Tamp, lock the portafilter in and take it out again: a deep imprint from the shower screen means too much coffee, no mark at all may mean too little, and a faint witness mark is about right. A puck screen, a gram more coffee or waiting a few seconds before knocking out all reduce the soup.
What it does not indicate
A wet puck says nothing about extraction quality. Plenty of excellent shots come from soupy pucks on machines without a solenoid, and plenty of terrible shots knock out perfectly dry. Judge by taste.
What people want to know
Should I add a puck screen to fix it?
A puck screen keeps the shower screen clean and spreads the incoming water. It does not dry the puck, because it does nothing about pressure venting after the shot.
Is a soupy puck bad for the machine?
No. It is messier to knock out and it leaves more residue in the basket, which is a cleaning consideration rather than a mechanical one.
Last reviewed 30 October 2026