General description Our 4Pcs S-Union Type A Filter Sponges are designed for effective filtration in swimming pools, aquariums, and spas. Made from high-quality, reusable foam, these cartridges feature a high-density mesh structure that efficiently filters out a variety of impurities, including leaves, grass, hair, and insects, ensuring a clean and clear water environment. Technical specifications Dimensions: 20 x 10 cm Center hole diameter: about 4 cm Usage For optimal performance, it is recommended to replace the filter sponges every two weeks. This will enhance filtration efficiency and maintain cleanliness in your pool, aquarium, or spa. Other information Durable and flexible foam material that is environmentally friendly and can be reused after cleaning. Cost-effective alternative to disposable paper filters, reducing waste and maintenance costs.