2 Pieces Spa Filter Cartridge for Pleatco PWW50 Hot Tub Filters, Replacement for Unicel C6CH-940, Jacuzzi Spa Business Whirlpool Filters Swimming Pool Filter: Made from 100% polyester fiber material for superior dirt and debris capture. Designed as a replacement filter for swimming pool and spa cleaning systems Product Size: Filter diameter: 150 mm (5.9 in), Height: 241 mm (9.5 in), Thread size: 46.5 mm (1.8 in) Product Features: Collapsible design increases filter surface area, reduces pressure differential, allows higher flow rate, extends service life, and is reusable after cleaning to help save on maintenance costs Compatibility: Fits most indoor and outdoor, in-ground and above-ground pools, hot tubs, and spas Function: These pool filters help maintain optimal spa performance by trapping dirt and contaminants to keep water clean and clear. Simply install and connect to your system for effective filtration