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Thanks Maddie. This morning I backwashed again and this time I added 2 cups of DE. Still no initial PSI change, but PSI does slowly climb over the next few hours. It's definitely working (pool getting clearer, backwash water filthy) but I guess there's something odd about my filter/pressure gauge...

Following advice in this thread I have added some DE to my sand filter to improve filtration. However, the resulting PSI changes are inconsistent so I'm wondering if something is off. Here's the data: Round 1 Filter was initially at 12.25 PSI Added 1/4 cup of DE at a time until filter reached...