There is an opinion that mixing boiled and unboiled water can be dangerous to health.
The World Health Organization recommends boiling water for 60 seconds to minimize the presence of bacteria and viruses.
Mixing boiled and raw water results in unboiled water.
If unboiled water contains bacteria and viruses, then when mixed they will appear in boiled water in a lower concentration, writes Amazingmicrowater.
A small amount of unboiled water is enough to spoil a large amount of boiled water.
From a microbiological point of view, you should not mix raw water with boiled water, just as you should not simply drink tap water.
When boiling, the concentration of impurities in water is significantly reduced. When mixing unboiled and boiled water, the composition of the mixture will be more similar to the composition of unboiled water.
When mixing unboiled and boiled water, nothing terrible will happen, but the mixture will actually be unboiled with all the ensuing consequences.
Earlier, the doctor warned about what kind of water is dangerous to drink.