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 out 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 type A filter sponge 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 swimming pool. Wide range of applications The swimming pool filter foam is suitable for swimming pools, baths, spa pools, aquariums and other occasions. A must-have tool for families and aquariums. Product features: 1. This foam sponge is a filter foam that can meet most of your needs. 2. It can be cleaned and reused, reducing your costs. 3. Soft and elastic, not easy to deform, long service life. High-density mesh structure Good filtering effect Product specifications: Type: filter cartridge sponge. Material: foam. Color: blue. Dimensions: 20x10x4cm. Hole size: approx. 4.0cm. Suitable for: swimming pools, spas, aquariums, etc. Package contents: 2 x filter sponge foam.