Since the mechanism and ability to remove contaminants varies by product, no single filtration system can protect against all contaminants. Choosing a filtration or purification device will depend on what you want to remove and how much you want to invest.
The EPA provides standards but does not endorse specific devices. It suggests that consumers match the filter to the contaminants and consider personal preferences for care and cost. There are three organizations accredited by the American National Standards Institute (ANSI) that certify that water filters meet EPA standards and work the way they should: Underwriters Laboratory, NSF International, and the Water Quality Association.
This content originally appeared on doctoroz.com.