KDF Lab Test Results from
Biological Research SolutionsLaboratory Service Performed: Evaluation of the Bacteriostatic Properties of a Water Treatment Device Containing an Alloy of Copper and Zinc (KDF)
Table
1 - Description of Test Procedure
|
| Test Day |
Backwash | Purge | Bacteria Injected |
Survivor Measurements |
| 1 | None | None | Yes | Every 10 liters for 100 liter total flow |
| 2-6 | None | None | Yes | Every 10 liters for 20 liter total flow |
| 7 | 15 min | 10 min | Yes | After 10 liter flow |
| 11 | None | None | No | Every 10 liters for 20 liter total flow |
| 19 | 15 min | 10 min | No | Every 10 liters for 20 liter total flow |
Table 2 - Results of Water Treatment Device Evaluation.
| Total Water Flow (1) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
|
Enterobacter Aerogenes Survivors (cfu/ml) |
||||||||||
| Day 1 | 6 | 4 | 5 | 5 | 2 | 3 | 6 | 5 | 8 | 8 |
| Day 2 | 6 | 10 | ||||||||
| Day 3 | 4 | 4 | ||||||||
| Day 4 | 24 | 7 | ||||||||
| Day 5 | 1 | 0 | ||||||||
| Day 6 | 0 | 2 | ||||||||
| Day 7 | 2 | |||||||||
| Total Water Flow (1) | 10 | 20 | ||||||||
|
Reduction in Endogenous Bacteria (%) |
||||||||||
| Day 11 | 80% | 73% | ||||||||
| Day 19 | 59% | 30% | ||||||||
|
No Enterobacter aerogenes survivors were detectable on Day 11 or 19. |
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Figure 1 - Model Water Test System
Submitted by Biological Research Solutions
John W. Wireman, PhD, Dated: February 25, 1991
Three Rivers, MI 49093-9287
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