Just wanted to show all what happens when a pool in eastern NC shuts down for three weeks. I got my hands full. The filter needs back washed about every 30 minutes. It goes up 10psi in that short of time. I'm beginning to think D.E. filters are not worth it. Going through a ton of D.E. and Bleach. PH was so high when I started it called for a gallon of Acid. Took seven drops to bring it back to the 7.2 range.