I have an ongoing problem with DE in the pool, and thanks to you folks, I have been able to make progress. However, it just recently got a lot worse, and my efforts are not yielding success.
1. Knowing that suction side leaks can cause DE to 'puff back' through returns, I have identified and fixed a suction side leak (pump o-ring).
2. I replaced 4 grids that had small holes or cracked plastic. I have an older pac-fab stainless steel filter, the plastic manifold had no cracks in it that I could find.
When disassembling the filter I noticed that the nuts were loose, so DE probably got into the system through the manifold-->grid port. Now everything is tight as I can make it (I was sure this was going to fix the issue completely).
Despite the above repairs, there is DE in the pool again.
I am at my wits end.
Is there something else I can fix? All of my pool equipment is quite old (came with the house).
Last summer, and in the beginning of this summer, I would get a bit of grey DE that would accumulate mainly on the vinyl seams after a few days.
Last weekend, right after my second backwash of the season, I found a *ton* of white DE all over the bottom.
I just spent the entire day disassembling and cleaning the filter, and replaced 4 grids. I was so proud, thought I had it solved; I added DE to the filter, vacced all the old DE out of the pool, and let the filter run for 4 hours - expecting to find a clean pool. What I found was a bunch of white DE.
A probably unrelated symptom is my Polaris 380 (booster-pump-backed) wheels have stopped moving (though the rest of the jets work fine), and after many repairs I have it isolated to a pressure issue.
Hoping someone can offer some tips to fix my old hardware.