The new range of FilterLogic hot tub and spa filters offers an economical and energy efficient alternative to your spa manufacturer’s original replacement filters. It is vital to keep well maintained filtration in hot tubs to ensure suspended dirt and debris do not cause damage to the integral pumps and the heating system. Replacing your filter/s will also help to prevent the build up of sludge that can potentially lead to microbiological contamination. It will also help to remove precipitated iron, calcium, body oils, lotions and dirt. The filter lasts for up to 6 months, please remember; it is recommended that you rotate filter sets every two weeks. The FilterLogic SFL16-6-7HM is compatible with a large number of filters from different manufacturers, this is why you should always compare the dimensions of your filter against the dimensions listed.  Compatible with the following filters / systems: - Pleatco: PJZ16, PJZ-16, PJZ16-F2L, PJZ16F2L - Darlly: 52512 - Passion: J2-25, J225 - Unicel: Jazzi Spa 2 Dimensions: Length - 181mm Outer Diameter - 143mm Inner Diameter - 51mm End Cap Fitting: MPT (Finer Threads)