Im having an issue with a pool thats driving me nuts and I need help. I have a client that is getting small air bubbles mainly out of one return, although i have witnessed it out of others and the spa jets. It has an Intelliflo VS3050. The bubbles are only present on low speed (about 900 RPM). This is a pool/ spa gunite, easy touch system, three way pentair valves on suction and return side. FNS plus DE filter with Hi flow valve, Master temp heater with a bypass and a polaris 280 with booster pump. Also a blue white digital flowmeter and intellichlor salt.
I have been through this system with a fine tooth comb! There is no air in the suction lines, no air in the pump basket, I have a clear check valve in the pump discharge before the filter with no air and a sight glass in the return after the heater and flowmeter but before the spa / pool valve... no air in this either. I have pressure tested all plumbing... no leaks.