Product review (4 stars): I purchased it so that my cool mister would start working again
I was between rating it 4 and 5 stars. I purchased it so that my cool mister would start working again, and it did the trick. I'm not sure it remedies all situations, however,  replacing the demineralizing cartridge was the answer to why my mister quit working. I love it when something works!
It also was a great price and came with a spare for future replacement.

Thanks!