This is a 1.5 GPM DLFC button for Fleck Controls with .69″ OD. Fits Fleck valves: 5600, 5800, 2510, 9100 & 4650 1.5 GPM DLFC Button for Fleck Controls, .69″ OD Sizing Information: This chart shows typical backwash rates for common media. The actual backwash rate required for a filter system is determined by the data provided by the filter media manufacturer. This data specifies a recommended backwash rate dependent upon the diameter of the media tank and the temperature of the filtered water. Consult with your media manufacturer for specific backwash rates for your system: Common Drain Line Flow Control (DLFC) Sizing by Tank Size and Media Type Tank Diameter Tank Area/ft2 Granular Activated Softening Resin Filox Micro Z 7″ 0.27 5 GPM 8″ 0.35 3.5 GPM 1.5 GPM 5 GPM 9″ 0.44 4 GPM 2 GPM 8 GPM 5 GPM 10″ 0.55 5 GPM 2.4 GPM 10 GPM 7 GPM 12″ 0.79 8 GPM 3.5 GPM 15 GPM 10 GPM 13″ 0.92 9 GPM 4 GPM 15 GPM 15 GPM 14″ 1.07 10 GPM 5 GPM 20 GPM 20 GPM 16″ 1.40 15 GPM 7 GPM 25 GPM 25 GPM 18″ 1.77 20 GPM 9 GPM 35 GPM 21″ 2.40 25 GPM 12 GPM 50 GPM 30 GPM 24″ 3.14 30 GPM 15 GPM 60 GPM 38-56 GPM
