We are running our HoMedics unit at half power and it can handle a gallon of water. At this speed, it uses about 40% of its energy every 8 hours. When using distilled water, it quickly became apparent that the cost would be higher than necessary, not to mention the cost of jars going to the landfill (this can be done many ways, but just for the simple use method, and yes we recycle ours home and then finally to the town center). The inlay that came with the unit seemed to do the job, but these unbranded inlays just don't do the job, even after our well water, water softening, and filtration system. I will not buy these again.
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