Features Birm® System. Fleck 2510SXT Specifications‡. 6.3GPM Backwash Required. Backwash Flow 3.5 GPM Backwash Flow 4.4 GPM Backwash Flow 6.3 GPM. Backwash Flow Rate - The minimum rate (in gallons per minute) that needs to be available for proper backwashing of the system.
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