World class ceramic water filters

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.

Run 2.

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).