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Home > Bacteria filtration ability
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Thresh Beale & Suckling
Consultant Analytical Chemists and Microbiologists
288 Windsor Street Birmingham B7 4DW
Telephone: 021-359-5954/5
Doulton Industrial Products Limited
Filleybrooks, Stone, Staffs.
Our Ref: CEC/YPS
10th March, 1978
Dear Sirs,
Doulton Filter Candle. Your Ref No. 1 Our Ref. E/B/1223
We have now completed our testing of the filter candle received from you
and the results obtained are as follows:
Testing procedures for Efficiency of
Bacteria Removal.
Two filter candles were fitted into stainless steel container provided by
yourselves. The filters were then washed with tap water until a clear filter
liquor was obtained - approximately 5 litres of water being passed through
each pair of filters.
Five litres of tap water inoculated with Serratia marcescens and Escherichia
coli was added to the upper chamber and the collected filtrate was assessed
for those organisms.
RESULTS
Run 1.
| Innoculated in upper chamber before filtration |
Serratia marcescens)
Escherichia coli.) |
Total organisms/per ml. |
Total organisms after filtration per ml. |
| Candle A |
Serratia marcescens
Escherichia coli. |
377x10(6) or 377,000 000 |
8
1 |
| Candle B |
Serratia marcescens
Escherichia coli. |
377 x 10(6) or 377,000 000 |
12
7 |
Run 2.
| Innoculated in upper chamber before filtration |
Serratia marcescens)
Escherichia coli.) |
Total organisms/per ml. |
Total organisms after filtration per ml. |
| Candle A |
Serratia marcescens
Escherichia coli. |
37.7 x 10(6) or 37,000 000 |
0
0 |
| Candle B |
Serratia marcescens
Escherichia coli. |
37.7 x 10(6) or 37,000 000 |
0
0 |
Comments
These results show a reduction of better than 99.99% and indicate the
performance in removal of bacteria the filter is suitable for use in
preparation of water for drinking and domestic purposes.
Yours faithfully
C.E. Coggan for Thresh Beal and Suckling
M.Chem.A, C.Chem, F.R.I.C.M.I.W.P.C.(Dip). |
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