Is it possible that when you add DE to the sand filter that it can come out and settle to the bottom of your pool? I've vacuumed up white stuff that appears to be DE everyday since I put some in. Seems like it is just going right through the filter.
It freezes some, but I keep the pump running when below 33*. Yes, I had a little algae (shouldn't have because I keep FC at 5, CYA at 70) so I slammed it and cleared it up. I decided to add some DE to filter better.
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