These little cartridges do a good job, but they don't remove all of the white dust. Our water is very hard I think. What I did was buy an air purifier to help and things got a lot better between the cartridges and the air purifier. I think if you have very hard water this is a must have if you don't want to spend a fortune on distilled water! I would also suggest an air purifier if you can afford it. UPDATE: I had to downgrade this product as I found that it only removes dust when the humidifier is used on the LOWEST setting! When I turned it on and left briefly on a dry day, I went back to the right one. covered with white dust! like that . I decided to buy a water still here at Revain to make my own distilled water rather than spend a fortune lugging around gallons of water! I believe that the distillery will soon pay off. Problem solved! :)
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