The Filter Cartridge is a key component of a pool or spa's circulation system, responsible for removing dirt, debris, and fine particles from the water as it flows from the pool or spa and back through the return lines. By continuously filtering the water, the filter cartridge helps maintain water clarity, supports proper chemical balance, and reduces overall system wear. It can be conveniently rinsed clean in minutes with a garden hose. Filter cartridges do not require backwashing, which helps conserve water and reduce chemical loss. Specifications Brand: Super-Pro Application: Spa Cartridge Area: 120 square feet Cartridge Top Cap: 2-1/8 Inch Filter Diameter: 5.375 inch Product Height: 30.125 inch