Pool and Spa Filter Cleaner -1 GallonEffectively removes dirt, oils, sunscreen, body grease, and hard water buildup that clog pool and spa filters, restoring peak performance and water clarity Large 1 Gallon concentrate provides long lasting supply for both soaking and spray cleaning application Can be used as a soaking solution for heavy buildup or as a spray cleaner for quick maintenance with no foam or sticky residue left behind Safe for all filter types, including cartridge, D. E.,