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I have 3 x 4" plates in my setup, the top one was standard bubble caps and the lower two have 3 x ProCaps in each.
I noticed the bottom ProCap plate was not very active compared to the other which was quite lively.
I swapped the bottom ProCap plate with the top standard bubble cap plate so I now have the two ProCap plates above the standard one.
However this same plate, now at the top, still shows very little activity compared to the other, could it be possible there's something wrong with one of the ProCaps allowing vapour through the down comers or something?