Product review (1 stars): I wish I could give a zero star review.
These filters don't last anywhere near as long as advertised. I've used distilled water in my kid's vaporizer in hopes of extending the life of the filters, but instead of 30 days, I can't get more than a few nights use out of them. I think 6 days was the longest I've used one before the smell became bothersome, and it was more than discolored by that point. I have followed all instructions to the letter, but still the end result is the same - smelly, moldy, discolored filters.