Washed out really well, we have several of those in the kitchen and shed in case the water for some reason (like an earthquake, etc, god forbid) is undrinkable. Once a month or so we'll pour the water on the plants and refill with fresh. I was told you could add a spoon or two of bleach to the water but that doesn't sound too delectable to me. Course if we ever have to drink them we'd probably be glad to drink whatever we have.
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