Specifications: Inner Filter:Length:25 1/4″, outside diameter:8 3/4″, filtration area:100 sq. Replacement Filter: Starite System 3, S7M120. High Efficiency Filtration: Uniformity and high-performance trilobal fabrics have a higher capacity than ordinary bonded fabrics. The trilobal shape of the fabric fibers also helps capture particles, increases efficiency without causing pressure drop loss, and helps reduce the frequency of filter cleaning. Reinforcement Structure: With thickened trilobal fabric, heavy chlorine and break resistant end caps and reinforced center support, the filter provides high power propulsion flow and crystal clear water for your relaxed and healthy enjoyment. Easy Maintenance: We suggest to rinse your spa filters regularly with clean water, this will help remove dirt and protect your filter material. With regular cleaning, the filter also needs to be replaced regularly to make your spa filter work more efficiently.