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
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