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
  1. Test Microorganism: enterobacter aero genes
  2. Concentration of test Microorganism: 300cfu/ml
  3. Flow Rate: 1.0 - 1.5 liters per minute
  4. 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.