Thanks. I just didn't think it should get stopped up that quickly. If I can't retrofit the pump I'll probably buy a new one. Most sites don't list any GPM rating for their pumps, very frustrating. I'm with you and think a 3/4 hp will be more than sufficient. The 1.5 I have is probably why the filter assembly and valve had to be replaced. Are there any health concerns with using bleach in place of shock?