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|The University of ARIZONA
Cysts - Beaver Fever, Cryptosporidium Oocysts, Giardia Test Performance
Applicable to : DOULTON DRINKING WATER SYSTEM WITH Ultracarb and Sterasyl elements, both, slimline and imperial series ceramics.
The University of ARIZONA
To: David Webb - Doulton Water Filters
Testing for Removal of Doulton Single Filter Housing with Ultracarb Candle for Removal of Cryptosporidium Oocysts.
The 8 1/2” Ultracarb ceramic candle was inserted into the single filter unit housing
as instructed. The unit was then connected to a 5 gallon pressure vessel.
An initial pressure test was conducted by closing the terminal outlet,
filling tile pressure tank with 10 liters of dH2O and pressurizing the
system with 30 PSI of nitrogen gas. After checking for leaks, the 10 liters
were allowed to flow through the filter. After depressurizing the system,
the pressure vessel was filled with 10 liters of dH20 and seeded with
10(8) formalized oocysts (10(7)/L). The water was stirred to ensure a
homogenous distribution of oocysts. The system was again pressurized to
30 PSI and the water allowed to flow through the filter. Two liters were
allowed to pass through the filter. Liter #2 was saved for processing.
The outlet at the terminal end was shut off leaving the system under pressure.
After 16 hours, liters 3-5 were passed through the filter saving liter
#5 for processing. After leaving the system under pressure for 8 more
hours, liters 6-10 were passed through with liter #9 collected.
Water quality challenge conditions:
No oocysts were found in any of the samples tested (100% removal). This represents
a greater than 6 log reduction of oocysts.
This filter unit performed very well and far exceeded the EPA recommended
3 log reduction (99.9% removal) or parasitic cysts.
Live cysts test at University of Arizona US Live cysts test at Water Research Council (WRc) UK E.coli test NSF standard 42 particulate US NSF standard 42 chlorine US NSF standard 53 turbidity US NSF standard 53 lead US Salmonella typhi, shigella dysenteriae and vibrio cholerae Inaba bacteria test UK Pesticides and herbicides test UK E.coli, heavy metals and THM's test Hong Kong Serratia marcescens and escherichia coli bacteria test UK
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