Cartridge Filter Our high performing cartridge filters are very effective and strongly recommended for maintaining the clean swimming environment of the pool and spa. The fine fibers of the cartridge element nicely collect all the contaminants and debris. The cartridge element can easily be removed from the filter tank to clean, which eliminates the filtration system backwashing. Features & Advantages Suitable for fresh or salt water No filter backwashing 50mm barrel unions for ease of plumbing No additional powder additives Compact UV resistant tank Easy accessible cartridg