High-quality materials: Foam sponge Made of high-quality foam and polyurethane, odorless, environmentally friendly, and with a high-density mesh structure that can filter many impurities in the swimming pool. High quality: Our filter sponge foam is thick enough, moderate in density, soft and elastic, not easily deformed, corrosion-resistant, and can be used for a long time. Reusable: Our filter sponge Type A can be cleaned and reused, with fast filtering speed and good air permeability. Our filter cartridge sponge is an ideal replacement for disposable filter paper and can help you save costs. Durable: Each cotton filter can be used for approx. 2 months. You can clean the filter sponge once a week to keep the water clean and reduce bacteria in the pool. Wide range of applications: The swimming pool filter foam is suitable for swimming pools, baths, hot springs, aquariums and other occasions. An essential tool for families and aquariums. Reusable washable filter: Replacing the paper filter element is part of your daily pool maintenance. Regular replacement of the filter element can lead to high costs. These washable and reusable foam filters will reduce your costs. Long working hours: The initial cost of this type of cartridge is slightly higher than that of paper cartridges, but its service life will be much longer than that of cassettes. Durable: : The service life of this foam filter is longer than that of the paper tube, and it can be cleaned and reused many times. Size: 20*10*4 cm Delivery quantity: 2 pieces