Product review (5 stars): This product is great. Before I found this I was using those ...
This product is great. Before I found this I was using those little anti-bacteria balls and each time I went to change the filter my humidifier was covered in an algae-like yellow slime, which took a bit of cleaning each time. I just figured that was the best I could get, but after the adapter on my humidifier lid broke (which housed the anti-bacteria balls) I looked for an alternative. After reading the reviews on the Holmes Humidifier Bacteriostat I gave it a try and wow, what a difference. Now when it is time to change the filter I barely see a faint line of staining around the water level, and none of the major slime I had before. And this is on a rather old humidifier, so I am very pleased. Definitely recommend this product.