FilterLogic spa and hot tub filters are economical and energy efficient. Ensure your hot tub runs as it should when using FilterLogic filters as part of your regular maintenance schedule. The high-flow moulded core of the filter reduces the load on the integral pump thereby maximising the life of the spa and ensuring optimal performance. Each filter lasts for up to 6 months, it is recommended that you rotate filter sets every two weeks. More Information Manufacturer FilterLogic Surface Area 50ft² Length 141mm - 5 1/2" Outer Diameter 199mm - 7 7/8" Inner Diameter 49mm - 1 7/8" End Cap Fitting SAE (Coarse Threads)