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@ioreka
+1 for this, make sure your tamping is level. if it's not, sometimes there's a pressure discrepancy/build up which results in the spray from the PF. along the same lines, it helps to make sure your tamped basket is free from any superfluous grounds (give it a blow/wipe/quick flick before you twist into the group head - everyone's got their own method but as long as it's free from excess and the tamping is level it doesn't matter how you do it, really). should eradicate that pesky spray. obviously if you're not in a rush backflush the group head using a blind filter basket to remove any old grounds too, before you put the shot on.