1, Temperature: In the cooling down process of the boiled water, temperature decreases to a certain threshold that is favorable for the growth of microbial.
2, Ions: some ions in water aggregated together when the water is boiling, less ions may lead to less hazard environment for bacteria，
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I can come up with only 2 factors:
1, Temperature: In the cooling down process of the boiled water, temperature decreases to a certain threshold that is favorable for the growth of microbial.
2, Ions: some ions in water aggregated together when the water is boiling, less ions may lead to less hazard environment for bacteria，