High quality materials: foam cartridge, washable sponge, pool filter foam is made of high quality PVC foam, good elasticity, sufficient thickness, moderate density, soft, not easy to deform, environmentally friendly environmental and durable. Good filterability: The foam filters have a high density mesh structure. It filters all kinds of impurities in the pond and effectively removes floating matter such as leaves, grass, hair, impurities, pines and insects. Reusable: Each Foam Spa Filter lasts approximately 2 months. The filter sponge can be cleaned once a week to keep pool water clean and reduce bacteria in the pool. Cost savings: Regular replacement of paper filter cartridges is part of of your daily pool maintenance and the benefits of being washable and reusable can lower your costs, reduce waste and last longer than paper cartridges.