I would like to evaluate the relative efficacy of various disinfection methods such as UV lamps, ultra-filtration, etc. to remove microbes from water samples. I may need to spike microbial standards into "blank" water samples. Are there commercial products which contain known amounts of non-pathogenic micro-organisms that I can use to spike into my samples?
According to my knowledge.
Testing of pathogenic bacterial effect to disinfection can be carried out by using E. coli.
There are bunch of product in market that sell packed E. coli.
You can also use EM4 or EM16 since its number of bacteria is already known.
Hope it will help.
Regrads.
"Easiest way" is to grow CFUs on selective agar plates of non-pathogenic strains of the species you with to test and then spike the sample with a known amount of CFUs.
For example of a few ATCC and FDA recommended strains, check out https://www.atcc.org/~/media/A0D8B646B84942088663F3B5A21CCAE8.ashx
Good luck.
As a follow-up, I found this product: a freeze-dried pellet of non-pathogenic E.coli which seems to be a good model system for water microbial contamination - https://www.fishersci.com/shop/products/microbiologics-epower-i-escherichia-coli-i-atcc-8739-2/p-4906830
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