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Ref No. [UMCES[CBL 11-020
11
Trial # 2 –
Test Filter #5, 0.1 µm (no pre filters).
19 Jan 2011
Time Point
Heterotrophic
Bacteria
(CFU / 1 ml)
E. coli
(MPN / 100 ml)
CW
Post 0.1 µm
CW
Post 0.1 µm
T-0 Initial
15,300
0
14.3
0
T-1 Mid
N/A
N/A
N/A
N/A
T-2 Final
11,500
0
7
0
Mean
13,400
0
10.7
0
After the 0.1 µm test filter, a 100% reduction in heterotrophic bacteria and a100% reduction in
E.
coli
were found.
Trial # 3 -
Pre filter 20 µm > Test Filter #1, 0.1 µm. 13 Jan 2011
Time Point
Heterotrophic
Bacteria
(CFU / 1 ml)
E. coli
(MPN / 100 ml)
CW
Post 0.1 µm
CW
Post 0.1 µm
T-0 Initial
16,500
30
62
0
T-1 Mid
55,500
15
66
0
T-2 Final
17,500
5
48
0
Mean
29,833
16.7
59
0
After the 0.1 µm test filter, a 99.89% reduction (3.3 log) in heterotrophic bacteria and 100%
reduction in
E. coli
were found.
Trial # 4 -
Pre filter 20 µm > Test Filter #5, 0.1 µm.
13 Jan 2011
Time Point
Heterotrophic
Bacteria
(CFU / 1 ml)
E. coli
(MPN / 100 ml)
CW
Post 0.1 µm
CW
Post 0.1 µm
T-0 Initial
15,000
150
41
0
T-1 Mid
9,500
150
23
0
T-2 Final
18,000
120
19
0
Mean
14,167
140
28
0
After the 0.1 µm test filter, a 98.24% reduction (2 log) in heterotrophic bacteria and a 100%
reduction in
E. coli
were found.