How to use your Swimming Pool Sand Filter In Depth Operational Guide Waterways Safety Lock Ring System for fast, easy access to filter internals. Waterway proclean plus 200 sq. ft. above ground cartridge swimming pool filter the item waterway proclean plus 200 sq. Above Ground Cartridge Swimming Pool Filter. Waterway ProClean Plus 200 Sq. Start-Service dial on the stainless steel pressure gauge.