Product review (1 stars): NOT NSF 53 CERTIFIED - WEASEL MARKETING
I did not buy these b/c it's plain they are NOT NSF 53 certified! Saying the "carbon block is NSF 42/53 APPROVED" or the "MATERIALS or COMPONENTS" are NSF 42/53 certified is a marketing ploy to trick buyers into thinking the FILTERING has been NSF tested to 42/53 standards.  NSF 42 only reduces things that taste bad. NSF 53 reduces lead, cysts and other unhealthy impurities. When a filter has been tested for both standards it gets certified for both... NOT the "materials" or the "carbon block". This company doesn't want to pay to have their filters independently tested by NSF but they want to APPEAR AS IF THEY HAVE. A company that makes filters can CLAIM they remove anything, but the buyer has no way of knowing if it's true unless the FILTERING is NSF 42/53 certified.... NOT the materials! BUYER BEWARE.