Birm® is a relatively light-weight and economical media for the reduction of dissolved iron. Like most iron removal medias, Birm® acts as an insoluble catalyst to enhance the reaction between dissolved oxygen and the iron compounds to form ferric hydroxide which is then removed through mechanical filtration in the media bed. As a catalyst, Birm® is not consumed in the iron removal process and it does not need to be regenerated. Over time, mechanical wear and fouling by other contaminants will reduce Birm®'s effectiveness and it will need to be replaced.
| Operating Conditions / Requirements: | |||||||
|---|---|---|---|---|---|---|---|
| Service Flow Rate | 3.5 to 5 GPM per ft2 | ||||||
| Flow Direction | Downward Flow | ||||||
| Typical Pressure Drop | 2-4 psi | ||||||
| Backwash Flow Rate | 10-12 GPM per ft2 | ||||||
| Typical Freeboard | 50% | ||||||
| Backwash Bed Expansion | 20-40% | ||||||
| Minimum Bed Depth | 30-36 Inches | ||||||
| Recommended Bed Depth | 30-36 Inches | ||||||
| Maximum Feed Temperature | 100F | ||||||
| Recommended pH | 6.8 to 9.0 | ||||||
| Weight | 35-40 lbs per ft3 | ||||||
Recommended Configurations for Residential and Light Commercial Applications
| Tank Size |
8 x 44 | 9 x 48 | 10 x 54 | 12 x 52 | 13 x 54 | 14 x 65 | 16 x 65 |
| Birm® Volume (Cubic Feet) |
0.75 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 |
| Bed Depth (Inches) |
26** | 27** | 33 | 30 | 32 | 33 | 34 |
| Rec. Service Flow Rate (GPM)* |
1.2 | 1.5 | 1.9 | 2.7 | 3.2 | 3.7 | 4.9 |
| Maximum Rec. Flow Rate (GPM)* |
1.7 | 2.2 | 2.7 | 3.9 | 4.6 | 5.3 | 7.0 |
| Backwash Flow Rate @ 40F (GPM) |
3.0 | 3.5 | 4.5 | 7.0 | 8.0 | 9.0 | 12.0 |
| Backwash Flow Rate @ 70F (GPM) |
3.5 | 4.5 | 6.0 | 8.0 | 9.0 | 10.0 | 15.0 |
* Manufacturer recommended flow rates. In our experience, successful treatment at higher flow rates is possible with pre-aeration.
** Bed Depth not optimal due to tank height.
