Filters & Guides
Why “NSF Certified” Is More Complicated Than the Marketing Suggests
That NSF logo on your water filter? It might be telling you almost nothing. A filter can carry the NSF mark, pass every test it was given, and still offer…
Chlorine in tap water is added on purpose to kill bacteria, viruses, and parasites — and ~90% of the US gets tap water treated with it. At normal…
That NSF logo on your water filter? It might be telling you almost nothing. A filter can carry the NSF mark, pass every test it was given, and still offer…