The valve on it is it a good water valve that screw in to adjust or a ball valve. A ball valve is to hard to adjust the air flow. The other can be adjusted in small amounts. In my eyes at first there was not enough air (volcanos)then you had it way to high(boiling out of control). Make certain you have a good valve to control the air in to the cup. After your fead back I would say you have big enough pump
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