Opened pool up this year, water was easy to get crystal clear. Pump seems to be working property at 10 psi. Everything is GREAT! However, when I go to vacuum the pool, my suction seems to be only 1/2 of what is used to be. I feel the suction if I put my finger almost inside the hole of the sweeper, but I know it was much strong than this last year. Any ideas? Thanks.