Hayward StarClear™ Plus C17502S 175 SqFt Cartridge Filter 120 gpm 50 psi. The Hayward StarClear™ Plus filter is a high performance swimming pool filter with a residential filtration rating of 4,500 gallons (17 kl) per hour (C751), 5,400 gallons (20.5 kl) per hour (C900), or 7,200 gallons (27.3 kl) per hour (C1200,and C17502). Manufactured from durable, corrosion-proof materials, they are designed for continuous or intermittent operation, for installation above or below the pool water line, for fresh or saltwater swimming pools or spas. StarClear Plus filters utilize a reusable single element, reinforced polyester filter cartridge to provide a high degree of water clarity with minimum care. Their unique design is such that no tools are needed to remove or replace the cartridge in the filter assembly. Simply spin off the locking knob, lift off the filter cover and remove the cartridge. It's that easy.