Thanks for the help. I am a little concerned about not being able to backwash for a week. My pool is REALLY dirty and my filter is losing pressure about every six hours. I'm running it 24 hours. I am also running an automatic vacuum that is independent of my pools filtration system, and it is filthy. My water is really cloudy. Should I wait until I can hold pressure for a while before adding it or should I not run my filter so often? Any ideas? Thanks again.