BIRM®

NSF/ANSI/CAN 61

Clack Birm® is a granular filter media commonly used for the reduction of iron and/or manganese from water supplies.

• Under the proper conditions, no chemicals to purchase for maintenance. Regenerant not required.
• Iron removal efficiency is extremely high.
• Negligible labor cost: only periodic backwashing required.
• Durable material with a long life and wide temperature range.
• Weighs only 36-38 lbs./cu. ft.

Physical properties
Bulk Density	36-38 lbs./cu. ft.
Effective Size	0.48 mm
Uniformity Coefficient	2.7
Mesh Size	12 x 50
Specific Gravity	2.0 gm/cc
Color	Black

Conditions for operation
Bed depth	24-36 in. 10-18 in multibed filters
Freeboard	50% of bed depth (min.)
Service flow rate	5 gpm/sq. ft. or higher depending upon local conditions
Backwash flow rate	12-18 gpm/sq. ft.
Backwash bed expansion	20-40% of bed depth

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BIRM DATA SHEET