【 Compatible Models 】:The replacement cartridge filters are compatible for RELXTIME all spa pools.Spa filter cartridge for for inflatable hot tubs. ※Note: All referenced manufacturers' names and part numbers are the trademarks of their respective owners. Mentioned for compatibility purposes only. 【Material and Dimensions】: Made of ABS material with high tensile strength.The opening is injection molded, with high strength, thickening of the filter membrane and stronger suction. Dimensions: 3.9"/100 mm, hole diameter: 2.4"/60 mm, height: 2.95"/75 mm. 【Efficient Cleaning】: The pleated structure provides a larger surface area, making the filter cartridge more efficient. This filter efficiently removes hair, leaves, dust, debris, sand etc. Enjoy clean leisure time in your pool and spa. 【Keeps the Water Fresh】: this massage pool filter keeps your pure spa water clean and fresh. Suitable for most massage pools, with this filter you can enjoy it safely and healthily. 【Practical Replacement】: Please replace the pool filter every 2 weeks. Ensures optimal filter pump performance. Easy installation, no tools required. The opening has the thread, it is easy to unscrew and replace the filters. The filter is flexible and practical. Easy to adjust and clean, so you can easily wash the filter after use and reduces costs. A