We've been using them with our Berkey canister for 7 years. I chose them because they filter everything I wanted to remove from our tap water, including fluoride. We have city water. I studied our city water records online to see what was in our water before examining the filters. Our city water contains almost all common substances, in addition, in recent years there has been a violation of mercury. I listed everything I need from our water and these filters remove it all. We are very happy with these filters. Our water always tastes good. One time it took us longer than usual to get the flavor right, so we let water through once or twice more and then it was fine.
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