I have a cartridge filter pump and because of the decorative rock formations around our pool and the fact that we have two dogs that swim in the pool a lot, I would like to switch to a DE filter so that I can backwash. I don't know if it's relevant, but I use only 10% liquid chlorine. I don't know the difference between a quad DE filter and a DE filter? And are there any recommended brands? We are in Houston Texas.