2 ft.³ Birm® High Flow Iron, & Manganese Filter. Birm® System. Fleck 2510SXT Specifications‡. 2 ft³ Birm System. 1 ft³ Birm System. 1.5 ft³ Birm System. 6.3GPM Backwash Required. 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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