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I have a 36,000 gallon rectangular shaped pool with two horsepower pump. I've always had air bubbles from one of the return Jets. And I suspect that the air is being sucked in through the filter canister lid right next to the pump and motor. It seems like the amount of bubbles can be affected by...

Pool pump and filter pushing de and filtered material back into inground swimming pool for about 60 seconds upon startup and the pressure gauge drops back down to the same as after backwashing. Pentair FNS Plus 60 fiberglass DE filter. It's doing this even with new O-rings in the valve handle...