Product review (4 stars): Non-Toxic Tank Cleaner
We live in a hard water area - above average actually. In the dry winter months we run three humidifiers in three bedrooms. Although we have a whole-house humidifier, it doesn't do enough when allergies and colds take affect.

We also installed a soft-water filter for the house, but even then it doesn't get rid of all the minerals. If you have humidifiers, you know the pain of cleaning out the heating core...often hacking at it with a knife; removing the scaling about 70% or so.

We've been running a humidifier (control) with one of these "demineralization" capsules and although it doesn't entirely remove the cleaning issues around the core, it does reduce it a bit but the outflow - the mist that we inhale - and the tank has less odor and less hard-water spots.

Since these are a drop-and-forget for 60 days, you just need to remember or set a calendar notice to change them out. I'm rating them at 4 Star for now as I want to finish up the remaining tablet and put the other one in a different unit to see if there is a difference of mineral buildup.

I will circle back if I notice any significant issues or lack of effectiveness. But for now, So far so good!

Tested February 2015; Product supplied by vendor. Opinions, good or bad, are 100% my own.