Product review (5 stars): A must-have for filters that make it through the season
When Honeywell stopped making the high quality double filter for their cool mist humidifier I was pretty pissed. You are supposed to replace your filter every year (or more frequently if needed), but now they only make low quality filters that fall apart and fill with mildew within a week. Having resigned myself to the sub-par filters available for my humidifier, I started researching how to make them last longer than a week or two. At $17 a pop, I couldn't buy a new one every two weeks for the duration of Winter.

I came across this product and it has worked great! I've been using the same filter for a few months now and there is still no bacteria, thanks to this solution. A bottle will probably last the whole season, but not much more. I will say that this solution does appear to leave some kind of sandy residue on the filter itself, but just soaking the filter in really hot water every few weeks rinses it right away and you are good to go.

I'm still mad that I spent a bunch of money on a humidifier that the company no longer makes quality filters for, but so glad that I found this Bacteriostat Solution to help my crummy filters make it through the season without filling with bacteria.

MOST DEFINITELY recommend.