2 Pieces Spa Filter Cartridge for Pleatco PWW50 Hot Tub Filters, Replacement for Unicel C6CH-940 and Jacuzzi Spa Business Whirlpool Swimming Pool Filter: Made from 100% polyester fiber material for superior dust and debris collection. Designed as a replacement filter for swimming pool and spa cleaning systems. Product Size: 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 difference, allows higher flow rate, extends service life, and is reusable after cleaning for cost efficiency. Product Compatibility: Compatible with most indoor and outdoor, above-ground pools, hot tubs, and spas. Functionality: These pool filters help maintain optimal spa performance by removing dirt and contaminants from the water, ensuring clean and healthy water conditions. Simply install into your spa system for effective filtration.