KDF Fluid Products, Inc.
KDF Lab Test Results from
Biological Research Solutions
Laboratory 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 Microorganism: enterobacter aero genes
- Concentration of test Microorganism: 300cfu/ml
- Flow Rate: 1.0 - 1.5 liters per minute
- Water Hardness: 100ppm
|
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. |
Figure 1 - Model Water Test System
Submitted by Biological Research Solutions
John W. Wireman, PhD, Dated: February 25, 1991
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