High-quality material: The foam sponge is made of high-quality foam and polyurethane, odorless, environmentally friendly, high-density mesh structure, which can filter many impurities in the pool. HIGH QUALITY: Our filter sponge foam is thick enough, moderate density, soft and elastic, not easy to deform, corrosion-resistant, and can be used for a long time. Reusable: Our Type A filter sponge can be washed and reused, with fast filtering speed and good air permeability. Our filter sponges are an perfect replacement for disposable filter paper, helping you reduce costs. Durable: Each cotton filter lasts about 2 hours. 2 months. You can clean your filter sponge once a week to keep your water clean and reduce in your pool. Wide range of applications: Swimming pool filter cotton is suitable for pools, baths, pools, aquariums and other occasions. A must have tool for home and aquarium. Product features: 1. This foam sponge is a filter foam that can meet most of your needs. 2. It can be cleaned and reused, which reduces your costs. 3. Soft and elastic, not easy to deform, long service life. 4. The type A filter sponge is perfect for use in and salt water. Color: Blue Material: PU sponge Package Contents: 10 x filter sponge column Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.