US
US Water Systems Inc
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The tannin filter I purchased cleared up my water for about 30 gallons. Then it went yellow again. It is not the fault of the filter. I have a little bit of iron in my water as well that clogged up the filter. I will know better how the tannin filter works once I can get another filter canister installed and run both a sediment filter first and then the tannin filter. Customer service was very helpful and honest about my water issues when I spoke to her.