3M Purification Inc (Aqua-Pure), made in USA, is a leader in filtration and separation with over 40 years of residential filtration experience. 3M Aqua Pure PI has numerous products that are certified by NSF International. NSF sets the standard for third party water filter system testing and their protocols have been accepted as the American National Standards Institute's standard test methods. The featured Drinking Water Filter Systems and the Replacement Cartridges are now available at LOTUSmart.com Hong Kong. All 3M Water Filter products at LOTUSmart are imported from USA, these products are tested and certified by NSF International against NSF 42 and NSF 53 for the reduction of the claims specified on the Performance Data Sheets. These Water Purification systems reduce sediment, chlorine taste and odor, lead, cyst, mercury, asbestos, VOCs and MTBE.