Compatible with MSPA replacement filter cartridges, designed to fit all MSPA models. Dimensions: diameter 11.5 cm, height 8.6 cm. (Improved version 2020) Model: FD2089. Outside diameter : 115mm; total height : 86 mm Keep your pool water clean and fresh using this high quality pool replacement filter cartridge. It helps keep the spa clean. The filter cartridge is installed inside the filter pump and catches dust as it passes through the system. Prevents dust from entering the pump and heater, and extends service life. For maximum efficiency, clean the cartridge weekly and replace it once a month or earlier. They are easy to clean and replace if necessary. Note: The data is all measured manually, please allow 1-3cm error due to differences in light and display, there may be have color differences, please refer to the actual item received.