My situation is this. Upon opening this year I noticed some leakage in what I think is the suction side. When I would switch my 3-way to the skimmers it would fill with about 10% air. It has worsened and now the pump runs but can only fill half the basket area. The strange thing is that when I bypass my DE filter the pump can hold its prime. There are still bubbles but its definitely better. I think its suction side because there are no leaks at all anywhere around the equipment or exposed pipes. The air in the intake tank also suggests it. I've done the surface leak tests with the hose but no luck. Any suggestions are welcome.
Pentair 1.5 hp pump
30K gallon gunnite
DE filter, 2 skimmers, 2 returns
Pentair 1.5 hp pump
30K gallon gunnite
DE filter, 2 skimmers, 2 returns