Product review (4 stars): MUST use Water tx, and Bacteriostat also
First off a loss of a star due to price, needs to be in the $15.00 range.

Second, I have seen horrible ratings for the Holmes Whole House Humidifier, Model HCM3888C. I must say I thought it was horrible due to the quickness of how fast it would go through filters. About a month the first time.
BUT, (depending on your water source) I have had GOOD LUCK, if you use the Holmes Humidifier Water Treatment AND Bacteriostat. Wish I knew this the first time!! Probably states that in the instructions, I didn't completely read.  Just FYI I add a cap full of water treatment to both tanks every time I refill them. (About 36 hours) and Bacteriostat, a cap full to each tank about once a week. I wait a week as my humidifier runs a lot, and I don't have to deal with standing water if the humidifier is sitting idle long periods of time.