Gravity water filters and NSF Standards hoax
Before purchasing a gravity water filter check if it is NSF Certified. Make sure it is "NSF Certified", and nit "Tested to NSF Standards"" or "meets NSF standards" or any other similar phrase. ;Unless your filter system is NSF Certified, all the claims it makes have not been verified by NSF.
NSF Certified vs. "Tested to NSF Standards"