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THANK YOU!!!!!, JohnT and waste, for your explanations -- especially the very helpful separate posting on DE filters. I had a fundamental misunderstanding of the direction the water flowed through the fingers of my filter (btw, it's a EC75A, not 65A as I had originally posted) and that somehow...

Thanks for your fast replies. I will get the water tested. It is clear now and it is under this condition that I would NOT expect to have to clear the filter so often. The pool company did the muratic acid clean of the filters back in June, again when the water looked clear but the filter...

I am a new pool owner (new pool and never owned a pool before) and quite frustrated that I can't keep our new Hayward DE filter clear and flowing through the SWG and heater for more than an hour at a time, i.e. the pressure increases by more than 10 psi from start in under an hour. It was...