Features: 1.Type I Pool Cartridge:Type I replacement cartridge is part of your pool or hot tub cleaning routine maintenance. 2.Premium quality: The Model I pool cartridge features a unique trilobal filter fabric construction and a durable, practical polyester material that allows for reusable cartridges. 3.Powerful Filtration Performance: This filter ensures clean and fresh water. This spa cartridge can effectively remove hair, leaves, dust, sediment, sand, etc. The powerful filtration function of the cartridge allows you to enjoy a safe relaxing time with your family and friends. 4.Easy to clean: Filter type I is made of heavy-duty polyester fabric paper, easy to clean. If you can clean and replace it regularly, the effect will be better. 5.Dimension: 42011 model 8*9cm; hole diameter is 4.8cm, suitable for pool filter pump Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Description: Material: ABS + non-woven Size?span style=";font-family:;color:rgb(23,26,29);font-size:14px;background:rgb(255,255,255)"> 8*9cm; hole diameter is 4.8cm includes: 1*Pool Filter OR 2*Pool Filters