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Probably not the clumping causing it. Make sure the coffee is fairly evenly distributed before tamping, ie no big peaks or troughs, so it tamps evenly. Tap the sides of the portafilter against your hand or level the coffee with your finger if you need to. If the flow acts like it’s a bit choked at the start of the shot and then starts running fast, grind a bit coarser and up the dose.
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Maybe tamping too hard?
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Did you change from the 14g to 18g basket? Those 14g baskets are impossible to work with
Jonny69
exteroceptive
birofunk
@Dammit
I am using a needle distribution tool to try to get rid of any clumps in my grounds but I'm having a real issue with channeling - what am I probably doing wrong here?