closed loop bubbles.


Cancer Sucks
Premium Member
I would bet there is a leak on the pre-pump side that is creating a venturi and the bubbles. Take a peak at the connection into the pump and from the tank and see if it takes care of it. :)


New member
What kindof pump do you have ?Pump could be cavitating, reduce output, see if that helps


Premium Member
It's a dolphin 1200. and there is no adjustment for flow.

I may have to add a valve after the head.