TYPE VI FILTER: VI hot tub filters are compatible with Coleman Saluspa, compatible with Lay-Z Spa, and other inflatable hot tubs requiring Type VI filters. Outer Diameter Dimension: 4.2", Inner Diameter: 2", Height: 3.1". Please check the size before purchase ULTIMATE FILTRATION: Made with 25% thicker filtration fabric that traps more contaminants than ordinary fabric. These replacement filters can effectively remove hair, leaves, dust, sediment, and sand from your spa and pool. Enjoy clean leisure time in your pool KEEP POOL OR SPA FRESH: The 50% open polypropylene core supports the filter fabric to maximize water flow, help maintain the best performance of the VI filter and keep pool water clear, bringing you the ultimate spa experience. EASY TO REPLACE AND CLEAN: VI filter elements Made of trilobal, it effectively absorbs dirt and helps your spa get rid of grime! Remove the VI filter from the pump, then wash it under strong water pressure to remove particles. Clean your pool