My wife and I recently bought a home which came with a really nice above ground pool and deck. Never had either one of us owned or maintained a pool before. Our problem seems to be the sand filter. I've noticed when I connect the vacuum brush with the hose through the skimmer everything I'm cleaning off the bottom of the pool is being shot right back into the pool through the return. Is this because of a bad sand filter? Any help is much appreciated. Thanks In Advance!