Product review (4 stars): I buy this every year for my floor unit humidifiers.
I buy this every year for my floor unit humidifiers. It appears to work as there is nothing growing in the machines through the humidifier season.  My only complaint is generic.  Like large humidifiers themselves, humidifier bacteriostatic solution can only be bought in a few months preceding the humidifier season and about half-way through the humidifier season.  Not just this brand; all brands.  Maybe this year I'll be proven wrong.

Addendum:  I have bought more bottles for the upcoming season and probably will get a few more shortly into the dry season.  BTW, they used to come in larger bottles; I would buy the larger ones if they were still available.

Humidification in the winter is desirable and keeping the machines clean is equally desirable.