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Table 1

Removal criteria for pathogenic microorganisms for the evaluation of potable reuse schemes

Microbial groupCriterion (log10 removal)Possible surrogatesNotes
Enteric virus 12 MS-2 bacteriophage  
Cryptosporidium spp. 10 Inactivated Cryptosporidium oocysts, aerobic spores Addresses also Giardia and other protozoa 
Total coliform bacteria 10 NA Addresses also enteric pathogenic bacteria 
Microbial groupCriterion (log10 removal)Possible surrogatesNotes
Enteric virus 12 MS-2 bacteriophage  
Cryptosporidium spp. 10 Inactivated Cryptosporidium oocysts, aerobic spores Addresses also Giardia and other protozoa 
Total coliform bacteria 10 NA Addresses also enteric pathogenic bacteria 
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