Basically my problem is every time I vacuum everything goes right back into the pool. I have taken out the sand and taken the laterals to two different pools stores and they said they can't find any cracks. I put fresh sand in as they suggested and still have the same problem. We just purchased the pool August 2013.The one pool store replaced the spider gasket because water drained out the backwash hole when. It was placed on recirculated. It didn't change anything. Help!!