This Reusable Pool Filter Cartridge for PureSpa S1 Type is made of PP, which keeps your water clean and fresh. It helps prevent dirt from entering the pump and heater, prolonging their service life. The cartridge filter is portable and easy to use. For maximum efficiency, clean the cartridges each week and replace them once a month or sooner. The filter cartridge is installed inside the filter pump and captures dirt as the water passes through the system. Compatible with PureSpa S1 Type and measures 74mm in height, 43mm in inner diameter, and 108mm in outer diameter. Get the most out of your pool and spa with this durable and effective filter cartridge replacement. Features: - It is portable and easy to use. - 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. - The filter cartridge is installed inside the filter pump and captures dirt as it passes through the system. Specifications: Material: PP Height: 74mm Inner diameter: 43mm Outer diameter: 108mm Compatible with: for PureSpa S1 Type Package included: 1 x Filter Cartridge Notes: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.