I hope I am not hijacking your thread, Mohawk, but wanted to add that mine is making a swooshing sound at the top of the filter...like shoosh-shoosh and it causes the pipes to shake a bit when it does this. Also, when that storm came through a large iron table was blown into the pool and it broke the drain cover so the drain has been half exposed. Could something have gotten into the drain that is causing this? I still consider myself a 'newbie' so am not sure exactly how everything works..... I just let it backwash for about 30 minutes and it hasn't helped. I think the swoosh is the problem but not sure what is causing it. Air? Debris in the sand?

Janis