Ultrafilters, especially steam sanitizable ceramic filters are tremendously effective at removing bacteria. In general a filter with a pore size of 0.2 microns or smaller does an excellent job of removing bacteria. Both of these technologies are used in medicine and industry with great and repeatable success. RO also removes 99.9% of bacteria when operating in spec.
This weeks’ question comes to us from Alexandria Occasio Cortez, who I am guessing is one of my followers and/or subscribers? I don’t know, but the question is a good one.