Because one of the reasons we have a humidifier is to keep the air humid during the winter months so our sinuses don't dry out and make us more vulnerable against infections, colds, etc. we use a full cap in each of the 2.5 gallon water reservoirs in our portable humidifier to ensure the water is bacteria free and smells nice too. I used it last year and it worked great and wasn't expensive at all. Worth the money to keep the water healthy!
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