Swimming Pool Filter: Made from 100% polyester fiber material for superior dust collecting ability. 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, ensuring low pressure difference, high flow rate, and extended service life. Reusable and easy to clean, helping reduce maintenance costs. Compatibility: Suitable for most indoor and outdoor above-ground pools, hot tubs, and spas. Function: Helps maintain optimal water quality by effectively trapping dirt and debris. Keeps water clean and healthy. Ideal for use with various spa and pool systems. Package Includes: 2-pack spa filter cartridges. Compatible with models including Pleatco PWW50, Unicel CH-940, and equivalent Jacuzzi or whirlpool filters.