【VI Cartridge Filter for Swimming Pool】: Height: 3.1 inches/80 mm, Outer Diameter: 4.2 inches/106 mm, Inner Diameter: 2.1 inches/52 mm. Suitable for Bestway Spa Series - Please confirm the pump model before purchase. 【Effective Filtration】: Filter VI Cartridge is mounted in the filter pump and collects dirt as it passes through the system, helps remove dirt and bacteria and provides you with clean and fresh water. 【Remove Impurities】: The massage pool filter is made of easy-to-clean and durable Dacron paper. Dirt is easy to wash off. Filter VI Cartridge prevents the growth of bacteria and thus secondary contamination. 【Easy to Clean】: Simply remove the filter from the pump and rinse off the dirt with a garden hose. Be careful not to clean roughly or use a high-pressure water jet, as this may damage the filter paper. 【Easy to Clean】: Simply remove the filter from the pump and rinse off the dirt with a garden hose. Be careful not to clean roughly or use a high-pressure water jet, as