Ultraviolet Energy Levels Required for 99.9% Destruction of Microorganisms


Levels are measured in microwatts at wavelength of 254 nanometers. Pura UV Systems provide greater than 16,000 microwatts of UV energy; VIQUA systems provide 30,000.

Bacteria
Agrobacterium tumefaciens 8500 Bacillus anthraci 8700
Bacillus megaterium (vegetative) 2500 Bacillus subtilis (vegetative) 11000
Clostridium tetani 22000 Corynebacterium diphtheriae 6500
Escherichia coli 7000 Legionella bozemanii 3500
Legionella dumoffii 5500 Legionella gormanii 4900
Legionella micdadei 3100 Legionella longbeachae 2900
Legionella pneumophila (Legionnaires disease) 3800 Leptospira interrogans (Infectious Jaundice) 6000
Mycobacterium tuberculosis 10000 Neisseria catarrhalis 8500
Proteus vulgaris 6600 Pseudomonas aeruginosa (laboratory strain) 3900
Pseudomonas aeruginosa (environmental strain) 10500 Rhodospirilium rubrum 6200
Salmonella enteritidis 7600 Salmonella paratyphi (Enteric fever) 6100
Salmonella typhimurium 15200 Salmonella typhosa (Thyphoid fever) 6000
Sarcina lutea 26400 Serratia marcescens 6200
Shigella dysenteriae (Dysentery) 4200 Shigella flexneri (Dysentery) 3400
Shigella sonnei 7000 Staphylococcus opidermidis 5800
Staphylococcuc aureus 7000 Streptococcus faecalis 10000
Streptococcus hemolyticus 5500 Streptococcus lactis 8000
Viridans streptococci 3800 Vibrio cholerae (Cholera) 6500
Mold Spores
Mucor ramosissimus (white gray) 35200 Penicillum expensum 22000
Penicillum roqueforti (green) 26400
Algae
Chlorella vulgaris 22000
Viruses
Bacteriophage 6600 Hepatitis virus 8000
Influenza virus 6600 Poliovirus 21000
Rotavirus 24000
Yeast
Baker's yeast 8800 Brewer's yeast 6600
Common yeast cake 13200 Saccharomyces var. ellipsoideus 13200
Saccharomyces sp 17600
Cysts
Giardia Lamblia < 10000 Chryptosporidium < 10000
* Recent research has shown that these cysts can be inactivated with 5000-10000. A tight carbon block filter will also remove these cysts.

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