Product review (5 stars): does what it claims
works great to demineralize hard water for 6 weeks in 1 gallon warm mist humidifiers used everyday, if set on low not high. you still have to soak the heating element in white vinegar monthly to remove mineral buildup, or weekly if set on high.  this is much more convenient than adding liquid treatment with every filling.  less than 8 bucks at walmart store but not available online.