I have dog water bowls outside and they are turning green. So I bathed all the time. So I put two bowls side by side. 1 with and without coal. The one with is always clean. I don't have to rub anymore. I also keep one in my stainless steel mug while I purify the water. Now that I think about it, aren't most water filters made out of charcoal? Yes. make a difference
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