The AquaHouse AH-S3G is a premium compatible water filter which has been independently tested and certified by the Water Quality Association’s Gold Seal program. The filter meets NSF/ANSI 42 standard for material safety, structural integrity, and has been tested for chlorine reduction. Also meets NSF/ANSI 372 standard for lead free compliance. Only products that pass rigorous testing and pass annual manufacturing facility audits are accepted onto the Gold Seal certification. This gives the user confidence the filter is of high quality and safe for use with drinking water.