Fully Certificated System Frizzlife SK99 under sink water filter system is rigorously tested and certified by IAMPO against NSF/ANSI 42&53 for Material Safety, Structure Integrity, Flow rate, and Filtration Effectiveness on eliminating but not restrict to chlorine, particle class, and lead. Premium Filtration Performance (0.5 Micron) Adopting 0.5 micron filtration accuracy, almost 10X higher than other brands, the compounded filter cartridges of SK99 under counter water filter consist of 8 layers of filtration materials. Certified to reduce Lead, Chlorine, Taste & Odor and Particulates. Leave in all the beneficial minerals. Fast Water Flow & DIY Installation The water filter for sink features with strong flow, it can fill up a cup of water in 3 secs. The installation takes less than 15 minutes, no plumber required.