1 hp Hayward pump , anyway had this problem before when I first brought this fIlter online in may. Only lasted a few days and the pool cleaned up nicely. Had a leak in the liner and took a while to fix resulting in lots of dirt on the bottom. Water is clear and balanced. Should I stop and clean filter in the middle of vacuuming so the filter isn't used up until this heavy dirt is gone or is a possible air leak any thing to do with it