While I didn't test the water before or after installing this filter, I know it helps. My water smells like chemicals straight from the tap. This filter leaves water "tasteless" and has a soft mouthfeel. For every house I buy, I add an entire house and an extra drinking water filter, so I've tried many over the years. This one wins for ease of installation and price. However, only a water test can tell exactly what it does.
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