We have a problem with a black algea that grows in our toilet bowls. Usually within a day or two of cleaning it starts to come back. We don't seem to have a problem with the faucets and the toilet taks are pretty much clean. We have tried every tank additive on the market and can't seem to find one that works for any length of time. This is a problem with all of the toilets in the house. Any help would be appreciated. Thanks Chris
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