Yep a last minute decision. I was set on a 60sf DE filter when one of the PB workers told me the 580sf cartridge filter is a better filter due to it being so much larger? Said something about better flow rates and more gallons per cycle. My pool will be about 16-18k, the 60sf de filter will do 43k gallons in 6 hours the 580 SF cartridge filter does 52k gallons in the same time. Okay but if the if only filters to 10 microns vs 5 microns for DE, isn't the same dirt just being recycl the even if it's filtered more times? Max GPM on the DE filter is 120 on the cartridge filter its 150 GPM max. Now I am confused.