Hi - I recently noticed a lot of air bubbles in my main return line. I immediately thought it was a suction side leak. I tried all of the usual suspects such as the unions and pump lid but everything looked good . The equipment is all new so the Pentair service people came out and said those bubbles are a by product of the in-line chlorinator. I turned the chlorinator off and sure enough the bubbles went away. It just seems like there is an awful lot of bubbles coming through that return line so wanted to see what the community had to say