Pack of 6 High-Efficiency Spring Filter Cartridges meticulously designed to capture large debris without quick clogging. Each measures 10 1/2inch x 6 3/8inch, expertly calibrated for use right after pool openings or for pools encountering heavier than usual debris. Compatible with Robotic Pool Cleaners: for CC Plus, Z5i, XL, , C3, C4, , M200, M400, M500, , M5, Bio, Triton Plus (old), Liberty, wave 65, and Wave 90. Part number: 9991433-R4 The Spring Filter Cartridges are designed to only trap larger debris and let fine debris pass through to prevent the cartridges from being clogged as quickly when the pool is especially dirty, like when you open the pool in spring. plastic frame more sturdy and . The premium spring filters can last 2-3 years. Please rinse the filter every 4-6 weeks for optimal performance. Protect the Pool Cleaner: The filter can effectively prevent dust and other particles from entering the cylinder, reduce the wear and tear of the cylinder, sufficient and into the