11.13 High Street Clare Suffolk CO10 8NY
Telephone: Clare (0787) 277244

I.S.HORNSEY - B.Sc., Ph.D., C.Biol., M.I.Biol F.L.S., M.Inst Brewing

E. Coli Removal - Applicable to : DOULTON DRINKING WATER SYSTEM WITH Sterasyl, both; Slimline and Imperial series ceramic filters.

CERTIFICATE OF EFFICIENCY

THIS IS TO CERTIFY THAT FIVE DOULTON STERASYL 10" FILTER CANDLES, MANUACTURED BY FAIREY INDUSTRIAL CERAMICS LTD., WERE INSERTED INTO A NP5 FILTER HOLDER AND TESTED FOR BACTERIAL REMOVAL CAPACITY. WHEN INSERTED INTO THE HOLDER THESE CANDLES SHOWED GREATER THAN 99.99% REMOVAL CAPACITY.

THE CHALLENGE WATER WAS INOCULATED WITH 3.60 x 10(4) WASHED VIABLE CELLS OF ESCHERICHIA COLI, WHICH WAS PASSED THROUGH THE FILTER HOLDER AT A RATE OF 3OO LITRES/HOUR. TEST WAS PERFORMED ON 3 DECEMBER 1988.

original signed by

DR. I.S. HORNSEY