Approximate UV Dose Required to Kill Contaminants
The following chart illustrates the approximate UV dose required to kill common waterborne pathogens including bacteria, viruses, and cysts as measured in J/cm2 (1000 µWs/cm2 = 1 J/cm2 ). This chart was compiled from various sources that are believed to be reliable, including Trojan Technologies, however, required dosages can vary in relation to your water's ultraviolet tranmittance (UVT), turbidity, and as a result of the presence of particular contaminants. Accordingly, these numbers should be used as a general guideline only.
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| Contaminant |
Dosage required to sterilize |
| 99.99% Effectiveness |
| Cryptosporidium parvum oocysts |
8 |
| Giardia lamblia cysts (Beaver fever) |
<10 |
| Vibrio cholerae (Cholera) |
3 |
| Shigella dysenteriae (Dysentery) |
3 |
| E.coli (Escherichia coli O157:H7) |
6 |
| Salmonella typhi (Typhoid fever) |
9 |
| Shigella sonnei |
9 |
| Legionella pneumophila (Legionaires’ disease) |
10 |
| Salmonella enteritidis (causes gastroenteritis) |
10 |
| Hepatitis A virus |
16 - 30 |
| Poliovirus Type 1 |
21 - 30 |
| Coxsackie B5 virus |
30 |
| Rotavirus SA11 |
31 - 36 |
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