"We solicited independent lab data from the makers, where it existed. We also used digital and chemical tests designed for pools and aquariums and avoided painfully unreliable home test strips."
"The most prominent shower filters rely in part on a zinc-copper mixture called KDF-55, known to be quite effective at neutralizing pure or 'free' chlorine."
"The market for filtered showerheads remains young and largely unregulated, and performance claims are only rarely backed up publicly by independent data."
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