I've heard of Berkeys and know a couple of people who swear by theirs. We live in a sort of "weird" area; our water comes from private wells that serve a small neighborhood and never gets in the hands of "city" processing. Our annual "water quality report" always shows it to be light years ahead of state standards. Main quirk is that it has a high organic content... we have a Brita filter for drinking water and it tends to turn GREEN after a while... same with the dogs' water dish; has to be washed regularly (which we'd do, anyway) or it starts growing green.