ProGrid vertical grid D.E. filters provide superior water clarity, efficient flow and large cleaning capacity for pools and spas of all types and sizes. ProGrid combines high-tech features and a ”service-ease” design for unparalleled filtration. Filter tanks are made from the most durable materials to meet the demands of the toughest applications and environmental conditions High capacity, rapid release manual air relief valve bleeds air with a quick quarter turn of the lever Heavy-duty, tamper-proof, one piece flange clamp securely fastens tank top and bottom and allows quick access to all internal components Square Foot: 60 Grid Type: Partial Color: Almond Type: In-Ground