KRYSTAL is certified by NSF International
NSF Standards is compulsory in US for house hold water treatment products, KRYSTAL got NSF certification.
http://www.nsf.org/
Since 1944, NSF International, an independent, not-for-profit organization, has been committed to making the world a safer place for consumers. Products evaluated and certified by NSF International include bottled water, food equipment, home water treatment products, home appliances, plumbing and faucets, and even pool and spa components.
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