Hello! These "crystals" are great for reducing the humidity in my houseboat. I live on the coast of Washington State and the humidity is high in the winter. I use these crystals to reduce humidity. One refill fills the reservoir, and you get about three cups of water from one refill. Crystals are consumed depending on the humidity of the environment. In my case, it takes about three weeks for the crystals to run out, and then I have to refill them. Take care, Bill.
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