General description The 4pcs Reusable Blue Foam Pool Filter Cartridge is designed for effective maintenance of sand filter systems. These filters are washable and reusable, providing a cost-effective alternative to traditional paper cartridges. They help keep your pool water clean and clear, making them an excellent choice for pool owners. Technical specifications Dimensions: 8.8 x 7.8 cm Type: I Usage These foam filters can be easily washed and reused, significantly reducing the frequency of replacements compared to paper cartridges. It is recommended to change a paper cartridge weekly, while these foam filters can last much longer with proper maintenance. Other information