Product review (1 stars): If you buy this, you will be sorry
I bought these tablets because we had been seeing some white dust on furniture and such, when using a cool mist humidifier.

After filling the tank and placing one tablet in the tank, I noticed that it dissolved in minutes not a week.  I was careful to place in the tank AFTER it was done filling with water.  So then after doing this and letting the unit run, we noticed a haze in the house.  Not just some white dust but our house filled with a white haze.  The white residue from these tablets is a whole lot worse than the white dust that comes without using these.

They were expensive considering they lasted for only 1 tankful of water.  And the dust they created will be forever to get rid of.

Don't make the same mistake I just made......use distilled water or something else not these tablets.