PHILIPS Countertop Reverse Osmosis Water Filter Dispenser, 5 Stages RO Water Filtration System Purifier with Aquaporin Technology Tested by NASA, 3:1 Pure to Drain, NSF/ANSI 372 Certified, Reduce TDS, ADD5930BK: This countertop water filter dispenser incorporates the Aquaporin Inside technology to deliver exceptional water filtration. This highly selective and long lasting aquaporin technology has been tested in partnership with leading space agencies NASA and ESA, to ensure astronauts have access to filtered water : With the 5 stage deep filtration down to 0. 0001 micron, this Philips reverse osmosis water filter system powered by Aquaporin Inside