Assertion: water filter | /r/HasProperty | tested
Facets:
value: rigorously
type: MANNER
Source sentences:
text: This water filter is tested and certified to have complied with the NSF4 standard.
text: If you’re worried about the chemicals that might be lingering in your filtered and treated tap water, though, and don’t want to start drinking the bottled stuff, I talked with Yoder about some of the most common chemical contaminants in drinking water and how to find the best water filters that have been rigorously tested and proven to actually work.