High Filtration Performance - Premium PET fabric, refined yarn and thick filter membrane, better dust removal ability, effectively trap hair, leaves, dust, sediment, sand, etc easy to clean and replace. Provides you with a cleaner and healthier bathing environment. The Type I replacement filter cartridge is part of your routine maintenance for cleaning your poolFor Bestway Type I Filter - Our replacement filter cartridge is compatible with Bestway Type I Filter. Outer diameter 3.1 inch, inner diameter 1.1 inch, height 3.5 inch. Suitable for Bestway I filters.Keep Water Fresh - This type I swimming pool filter has powerful filtration performance to keep your pure spa jet massage water clean and fresh. It applies to most swimming pools or hot tubs, you can enjoy from the spa to the massage pool safe and healthy without worries. Tip: It is recommended to change the spa filter regularly to maintain filtration efficiency, and replace it every 2 to 3 weeksEasy to clean - Our replacement pool filters Type I have extra-durable plastic pleats and quality Dacron paper. Our spa filters for swimming pools and hot tubs are so easy to clean, removing them and washing with water. so you can reuse them again and again. Enjoy clean recreation in your swimming pool.