We have a 24 round AG vinyl pool with lower spot in the middle. 1 1/2 HP silica doughboy pump, 150# hayward filter. The flow from the return is so strong that it is difficult to vaccum pool (can't see bottom). We did not have this problem last year. My husband says no, of course, but I am wondering if he put the wrong return eye in pool. Are there different sizes? This is making a giant whirlpool in pool! Thanks for your input