Summer pool cartridges are compatible with Bestway VII and INTEX D. The cartridge is mounted inside the filter pump and can filter out dirt, leaves and hair, leaving your pool/hot tub debris-free and water clean. The filter cartridge Can filter out excess dust and dirt, optimize pump performance and extend equipment life. The cartridge is easy to use and clean, please change the pool filter every 2-3 weeks. Ensure optimum performance of the filter pump. Note: 107mm x 95mm. Please check that the product size matches your filter pump before purchasing. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.