Product review (5 stars): the goop (for lack of a better descriptor) rinses off very easily
This stuff works by keeping the minerals in a goop in the bottom of your humidifier rather than being expelled through the mist. That means you still have to regularly empty out the bottom of your humidifier. However, the goop (for lack of a better descriptor) rinses off very easily. I run water from my reverse osmosis filter with a TDS of only 18 so maybe my opinion is skewed too positive. Take it with a grain of salt if you have super dirty tap water.