The cartridge filters have been specifically designed for in-ground, on-ground, and above-ground pools. The injection molded tank provides durability and years of dependable service. The 100% polyester media cartridge provides excellent water clarity. Available in sizes from 90 to 180 sq. ft. Speck offers cartridge filters & filter systems for above-ground, on-ground and small in-ground pools. The Speck Pump Models A91, Model E71, Model ES90 and Model S90 provide economy, reliability and quiet operation. The corrosion-free cartridge filter provides outstanding water clarity. Together the pump and filter combinations offer exceptional value and quality for the sensible pool owner