ANNEX 58 TO APPENDIX E DEVICE EVALUATION #58
HYDRO-PHOTON, INC. – STERIPEN™
...
Although the testing confirms the SteriPEN provides a 6-log bacteria and 4-log virus removal in
clear (low turbidity) water only, it did not confirm the SteriPEN provides similar bacteria and
virus log removals in more challenging (higher turbidity) water.
...
Protozoan cysts (Giardia and Cryptosporidium) on
the other hand are the least resistant, requiring very low UV doses
...
In regards to determining effectiveness against
microbiological pathogens a conservative approach is taken. Based on the manufacturer’s
statement that this device is intended to treat clear water, independent testing challenging the
device in clear water only (and a natural water of unknown turbidity), and the inconclusive effect
of turbidity on UV disinfection, the SteriPEN is not expected to consistently provide adequate
reduction of bacteria, viruses, and cysts even when using the optional prefilter when treating
more turbid waters.
...