Product review (4 stars): Extend the life of your filters
Keeps my humidifiers clean and slime free when used with RO water. Not sure how it would work with high iron or salt content and I don't plan on finding out the answer.
One set of filters for the entire winter. That's a first.
Says to use a capful but there are so many capfuls in a bottle that the cap liner falls apart. Mine fell into the humidifier reservoir and I had to fish it out.