Natural Chemistry Filter Perfect Filter Perfect is a highly concentrated deep cleaning solution that removes deep set oils, grease and scum build-up on pool & spa filters. It is very effective on cartridge elements, D.E filter grids and sand filters. Filter Perfect improves filter efficiency and lengthens cycles between filter cleaning. Filter Perfect is compatible with Chlorine, Bromine and other alternative sanitizing systems. Filter Perfect works on both Pool and Spa filters! Filter Perfect is the perfect sand and cartridge filter cleaner!