Save Costs - Regular replacement of paper filter cartridges is part of routine pool maintenance, which can lead to increased expenses and waste. Our reusable and washable foam filters offer an ideal alternative to disposable filter paper. Filter sponges do not need frequent replacement. Good Filtering Effect - Our Foam Filter Cartridge features a high-density mesh structure that effectively captures a wide range of impurities in swimming pools. It efficiently removes leaves, grass, hair, debris, insects, and other floating particles. High Quality - Made from high-quality sponge material, these swimming pool filter foams are sufficiently thick with moderate density, soft texture, and resistance to deformation. The environmentally friendly, washable design ensures durability and long service life. Ideal for S1 type filters. Reusable and Washable - Each Spa Foam Filter can last up to approximately 2 months with proper care. Cleaning once a week helps maintain water cleanliness and reduces bacteria buildup. The filter element is easy to clean and install. Application - This washable foam filter is compatible with S1 type filters and most standard pool filters on the market. Suitable for use in pools, spas, and aquariums to help maintain clean water. The Foam Filter Cartridge provides effective filtration and is designed for repeated use, helping reduce ongoing maintenance costs. Featuring a high-density mesh structure and made from high-quality sponge material, it offers good flexibility and excellent water permeability. Key Features: 1. Moderate foam density with excellent water permeability. Thick construction resists breakdown while capturing a high volume of pool impurities. 2. Weekly cleaning is recommended to maintain optimal performance. Product lifespan may vary based on water conditions, usage, and maintenance practices. Size: 20 x 10 x 4 cm Material: Sponge Package Includes: 4 x Pool Filter Foam