I submitted a previous review which Revain removed because it contained links to sources related to NSF certifications. And now I don't have the original review to edit, so here's an abridged version of what I can remember: The company claims to be NSF 42 and 372 certified (by WQA) as of 7/5/2021. There is only evidence for the first, but not for the second. So all we know is that this water filter can aesthetically filter out some contaminants (NSF 42), but even with components like lead (NSF 372) we just don't know. I have already returned my product because when I contacted the company to inquire about their position on NSF 372 they gave me a WQA link that did NOT say that this filter was certified. This filter had no effect on the TDS score. Obviously, this only measures one particular aspect of cleanliness, so I won't go into too much detail here. And as for all the other reviews that claim this filter works wonders, it doesn't take long to filter out the ridiculous dirt your filter has. picture water. But if you can't taste and identify lead, copper, and other contaminants, statements like "Oh my god, this water is so pure!" holds no. Water. There's a reason lab tests exist. I gave 2 stars instead of 1 because the installation is quite easy and the instruction manual is well done.
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