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I tried that and it did not stop noise.

I have a pre 1999 nautilus fns 48 de filter. Recently there has been a consistent gurgling noise coming from the top of the filter housing which seeems to be coming from the air relief pressure valve system. No water is escaping from it and I sprayed shaving foam around area but didn’t see...

I have a crazy question. I have a hayward slide valve attached to a Hayward DE filter. For the last few years I have been unable to rotate the handle to set the locking pins in place. It never seemed to be a problem as in no water leaked through the backwash hose when in down filtering position...