As per the title, I've had a recent development (about a couple of months) where the shot starts bubbling in the spouts of the water filters at about the half way mark.
The machine is about 3yo, and was recently serviced. Nothing has really changed in those 3 years, even the blend is the same.
So far, I've tried - different water. We normally use an Everpure Claris filter, but due to being an idiot, I broke it, and am waiting for a new head. We're using Everpure cartridges that I normally use to filter our drinking water, though this wasn't an issue during the lockdown mid last year.
Tried changing grinder - normally use a Ceado E37S, though have a Mazzer Mini Electronic as a back up. Doesn't matter which grinder.
Tried different beans - bought some from Toby's Estate in Manila (I'm in the Philippines) and the result was the same.
The machine normally sits at about 92.7ºC, and this has never been an issue. We're at about 1500m, but again, this has never changed.
The actual workflow is:
-Grind 22g in to dosing cup
-Cup to portafiler shake, flip, then remove dosing cup
-Tamp with distributer only (though I've tried finger distribution and tamping, also distribution tool + tamping, all the Concept Art calibrated tamper). this also happens to multiple individuals, including baristas, so I doubt it's just that I suck.
Oh, the coffee actually still tastes fine. It's doing my head in though, as I'm a ristretto person, and the bubbling messes with my timing.
All these steps have produced no issues until recently.
The only thing I can think of is that scaling may be causing the issue, but if anyone has any ideas, I'm open to them!
Video below:
Thanks for any tips or suggestions!
Z...
The machine is about 3yo, and was recently serviced. Nothing has really changed in those 3 years, even the blend is the same.
So far, I've tried - different water. We normally use an Everpure Claris filter, but due to being an idiot, I broke it, and am waiting for a new head. We're using Everpure cartridges that I normally use to filter our drinking water, though this wasn't an issue during the lockdown mid last year.
Tried changing grinder - normally use a Ceado E37S, though have a Mazzer Mini Electronic as a back up. Doesn't matter which grinder.
Tried different beans - bought some from Toby's Estate in Manila (I'm in the Philippines) and the result was the same.
The machine normally sits at about 92.7ºC, and this has never been an issue. We're at about 1500m, but again, this has never changed.
The actual workflow is:
-Grind 22g in to dosing cup
-Cup to portafiler shake, flip, then remove dosing cup
-Tamp with distributer only (though I've tried finger distribution and tamping, also distribution tool + tamping, all the Concept Art calibrated tamper). this also happens to multiple individuals, including baristas, so I doubt it's just that I suck.
Oh, the coffee actually still tastes fine. It's doing my head in though, as I'm a ristretto person, and the bubbling messes with my timing.
All these steps have produced no issues until recently.
The only thing I can think of is that scaling may be causing the issue, but if anyone has any ideas, I'm open to them!
Video below:
Thanks for any tips or suggestions!
Z...

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