Type VI Spa Filter Pump Compatible with Most Massage PoolKeep the Water Fresh: Made of durable non woven fabric, this pool filter cartridge can efficiently sweep away a variety of debris, dirt, hairs, sediment, etc. It will achieve optimal water flow and circulation that prevents dirt from getting into the pump and keep your pure spa jet massage water clean and fresh. Compatible With Replacement: Our Type VI filter cartridge measures 3" (80mm) in height, 4" (104mm) in outer diameter, and 2" (52mm) in inner