HDX Basic High Flow Household Compatible Pleated Filter by CFS HDX Basic High Flow Household Compatible Pleated Filter by CFS Pleated-Universal fit - fits HDG4HS4 and all major brands of high flow systems Reduces sediment-5 micron , Lasts up to 3 months Fits in place of GE replacement filter H for models: GXH40L, GXWH35F, or GNWH38S NSF certified