Hello all. Short version is bought a house that came with a swamp. Thanks to pool school, the BBB and you great folks, my water is crystal clear but I am still vaccing debris off the bottom, thwere was a TON of it and I have probably cleaned my cart filter at least 40-50 times to get this far. Shock is still going due to debris. When I was vaccing today I noticed that there were spots of debris that didn't go away want I passed the vac over them. I got my brush and stuck the last set of bristles in the spots and noticed that it droped down into it, I swirled it around and the debris churned up. So I discoverd that I have a yet undetermined number of "pits" or "divots" in the bottom of the pool liner that debris has collected in. I assume this is not normal. Other than bing a pain to keep clean, is this a major problem?