BTW, I had been told by few pool owners to have saltwater (instead of chlorine) and DE (instead of cartridge for the filter). But all the pool builders, whom I interviewed, were against saltwater (due its corrosiveness to coping, water features and equipment) and DE (because it needs backwashing). What is your recommendation? I am asking since I noticed (from the posts) that some pool owners, who used to have chlorine, changed theirs to saltwater. I don't want to regret the wrong decision later and bear the new expenses (and time) to convert the chlorine to salt water (and/or cartridge filter to DE)