411 - NY (delmar6x@lycos.com) 2020/12/30(水) 00:58:55 ID:k9vyyUjM0
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Chloramines are used テ「ツツ nearly always as a secondary disinfectant テ「ツツ because they produce fewer byproducts than chlorine and they last longer, so water stays safe at the farthest reaches of a system, according to EPA.