I battled this all year last year and its back again! It is a fine brown/tan sediment that vacuums very easily or just disappears if you brush it or walk through it. I have vacuumed in the evening, closed the automatic cover, opened it the next morning and it's back. I vacuumed to waste several times last year but it would show up again every few days. I'm absolutely positive it is not sand. I sucked it up with a turkey baster one day last year to take to the pool store (they were clueless) and it just dissolves then after a few hours settles back to the bottom. Please Please Help! I am at my wits end. Ready to fill the pool in with dirt and make a garden:-) I have pictures if there is a way to post them. Thank you for any help.
Lisa

27,000 gallon IG concrete pool installed in 2000, owned by me since 2009.