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Hayward® brings together in this catalog more than 57 years of experience as a manufacturer of filtration and comfort equipment for swimming pools. All the key PRO GRID™. REPLACEMENT. CARTRIDGES. ➊High-Profile Manual Air Relief provides an easy way to manually purge air trapped in filter .High-capacity, rapid-release manual air relief valve bleeds air with a quick quarter turn of the lever. The Hayward ProGrid DE filters offer superior