These WHF discussions are pretty fruitless. Those who swear by it will tell you that, and those who don't have one will tell you it's not needed. Not only is it all opinion, the water in this vast area differs from place to place.
It's a very personal choice based on very personal circumstances. If you don't like the taste of the water, or if it's leaving water spots or making your skin dry and itchy, then that should guide your decision. If you don't have a problem with any of that, don't buy one!
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It's harder to hate close up.
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