We purchased our current home about 8 years ago and with the house we also got a 20' above ground pool surrounded by a deck. I had never owned a pool before so it took a lot of questions from my local pool supply dealer and trial and error but I've learned a lot. I'm new to this forum so I hope you'll give me a break this once if your answer gets technical. Here's the situation. The previous owner put the pool in probably around the year 2000?? and left very little information for me to go by. I distinctly remember the guy saying that the line for the center drain went "so deep it would never freeze up in winter", but that's not my problem. The problem is I think that the center drain is clogged. The reason why I think this is the case is because it doesn't appear to be sucking the dirt off the bottom of the pool. I will vacuum the pool very slowly trying to pick up as much of the dirt as possible but a few days later there our pockets of dirt that have accumulated around the depressions and creases in the liner. I had this problem last year and it was not as bad just acceptable. I replaced the sand in the sand filter last year thinking it may have something to do with that. Is it possible to unclog the drain if it really is clogged and if so how is that done? be happy to answer any questions if I've left anything out by accident. Hope somebody know how to fix this. Thanks.