PUROSUR FD2089 pool and spa filter cartridges are designed to be compatible with FD2089 filter cartridges and are suitable for all current for models, ensuring a precise fit and effective filtration. Effective filtration you can rely on: measures 6 cm in length (3.4 inches) and 11.5 cm in diameter (4.5 inches). This provides efficient filtration, helping to remove dirt and debris to keep spa water clean and fresh. Regular replacement for performance: to maintain filtration efficiency, the cartridge regularly, especially during periods of prolonged spa use. Replacing at least every two weeks is recommended. Easy maintenance: these filter cartridges are easy to rinse and clean. Note that cleaning is effective only for a limited period before replacement becomes . Wide compatibility: in addition to FD2089 compatibility, these cartridges can be used with various other pump models. Please refer to your filter pump manual for confirmation before use. Use scenarios Routine spa maintenance: use a fresh cartridge every two weeks during normal spa use to maintain clear, clean water. use periods: more frequently during times of heavy spa use or in dusty environments to preserve filtration performance. Multimodel setups: suitable for households with multiple pump configurations that support FD2089 compatible cartridges; verify compatibility with your specific model in the manual before installing.