Natural Chemistry’s Filter Perfect gives pool and spa owners a powerful , concentrated cleaner to cut through the thickest, nastiest oil, grease and scum build-up on all pool and spa filters, including sand, diatomaceous earth, and cartridge styles. Filter Perfect’s chemical solution vastly improves filter efficiency by restoring lost surface area, clearing water and improving overall pool and spa health. This cleaner is compatible with chlorine, bromine, and other alternative sanitizing systems.