Product review (5 stars): It works!
I was on the verge of throwing out my humidifier after it started to have an unpleasant smell. Despite cleaning it I couldn't get rid of the smell - it always came back quickly. I found this on amazon after a bit of searching against the possibility - I didn't know the product existed but hoped there may be something like this. It works just like it should the humidifier is no longer smelling bad whilst operating and now I can keep my indoor environment healthier.