It is a compact, stainless-steel Drinking Water System that installs quickly on the countertop or under the sink. NSF-certified to treat contaminants of Health Concern (Std. 53), contaminants of Aesthetic Concern (Std. 42), and Emerging Contaminants/Incidental Compounds (Std. 401), you and your family can safely enjoy water filtered by the Aquaversa without worrying about unacceptable levels of contamination. Multipure drinking water systems are NSF-Certified for more contaminants than any other water filters that still leave the minerals in the water. Out of all the non-RO filters in the NSF and WQA databases, these filters have passed NSF testing for the most contaminants. Multipure is also rated #1 by Consumer Reports for best sink drinking water filter.