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It would be part of the piping going from your pump to your filter. All it is is a valve that prevents any backflow, so that water cannot return to the pool through the suction lines. If you just have nothing but pipe going from the pump to the filter, you probably don't have one. You can buy...

I had a similar problem with DE returning to the pool. You are correct in that if DE is coming through a return, it usually means torn grids. But if you have DE coming back through the suction line, it could be different. I had this problem and it was solved by installing a check valve...

Thanks for the reply! I will try this tomorrow.

I have owned a pool now for 4 years and have recently decided maybe I should start taking better care of it :-D I would like some advice on how to proceed because my chemistry is out of whack. Here are my test results: FC 15 CC 0 pH 7.5 TA 200 CH 650 CYA 100 I am also fighting a minor mustard...