2 Pieces Spa Filter Cartridge for Pleatco PWW50 Hot Tub Filters, Replacement for Unicel C6CH-940, Jacuzzi Spa Business Whirlpool, and Swimming Pool Systems Made from 100% polyester fiber material for superior dust and debris collection Designed for efficient filtration in swimming pools and spa cleaning systems Product Dimensions: Diameter: 150 mm (5.9 in), Height: 241 mm (9.5 in), Thread Size: 46.5 mm (1.8 in) Collapsible design increases filter surface area, reduces pressure differential, allows higher flow rate, and extends service life Reusable and washable for long-term cost savings Compatible with most indoor, outdoor, and above-ground pools, as well as indoor and outdoor hot tubs and spas Helps maintain optimal water clarity and system performance by capturing dirt and contaminants Ideal for use with Lay-Z-Spa and similar spa systems to ensure clean, healthy water