Technically only certified against the taste and smell of chlorine, but of course it helps in everything. If you have really dirty or rusty water it won't last as long, you'll need to get an equivalent "Max" replacement, the bad reviews don't seem to get it. Where I live the water is nice and soft and I basically have to filter out chlorine for CPAP and drinking water and it definitely removes the smell and taste of chlorine for a full six months.
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