*Made of high quality material, durable and practical to use. *The filter cartridge is installed inside the filter pump and captures dirt as it passes through the system. *The cartridge filter is to keep your water clean and fresh. *Prevents dirt from entering the pump and heater and prolongs service life. *For maximum efficiency, clean cartridges each week and replace once a month or sooner. Specifications: Compatible Models: Bestway VI Compatible with SaluSpa, Lay-Z-Spa 90352E Product size: 105mm*80mm*50mm Package Contents: 1/2/4/6 * Pool Filters Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.