Product review (4 stars): This stuff works pretty well.
I cant really tell that this product makes my filters last longer. I think it depends on your water
and if you are using distilled water (which I dont).
It does cut down a lot on mold that turns the water into a green slime, but you will still get mineral
deposits forming in your humidifier and filter as this product can do nothing to prevent that.

So if you are using fairly soft water to start with, at least you are getting rid of slimy "jelly water"!
and only have to worry about a little bit of mineral deposits.

If you can afford to use distilled water in your humidifier, plus this stuff, then I can see a big change
in the frequency of cleaning and filter changing. That would be the ideal way to go.

Using tap water, I do notice that the air smells better.
No "musty" smell, the air smells fresh and clean.

So, I do recommend this product, but don't expect too much if you have hard water.
And you will still need to clean your humidifier regularly depending on the amount of disolved solids in
your water.