Well, maybe it's a bit more complicated than that. It's certainly true that if you're using a water filter to remove something dangerous rather than remove "har

Well, maybe it's a bit more complicated than that. It's certainly true that if you're using a water filter to remove something dangerous rather than remove "hardness" or "chlorination", then you're going to want a certification (and regularly test to see if the RO filter is still working). I'd put ship, cistern, and catchment on that list of critical filters. However, if your decision is primarily based on flavor (as the article's is) or mineral build-up, then it's not clear that it's so important since you're drinking the water anyway! I'd note that one brand you may be referring to (although it's true for others) has both "residential" and "professional" series. The latter are WQA Certified (NSF/ANSI 58 & 53)... although you won't find them listed on the NSF website, they are both ANSI and SCC (Canada) certified. http://yourwaterfilterguide.com/difference-apec-water-residential-reverse-osmosis/ http://yourwaterfilterguide.com/difference-apec-water-reside... https://www.wqa.org/learn-about-water/faqs https://www.wqa.org/learn-about-water/faqs