Pure Aqua, Inc. designs and manufactures water treatment systems in addition to industrial brackish water reverse osmosis systems. In May 2012, Pure Aqua, Inc. successfully manufactured and supplied three identical industrial brackish water reverse osmosis systems to a major company in Egypt. The objective was to produce drinking water with less than 500 ppm. The systems consisted of RO systems with feed/backwash pumps, multi-media filters with clack valves and chemical dosing systems. The three RO systems were each designed to produce 43,000 GPD from well water of approximately 5000 PPM TDS. For more information click here: http://www.pureaqua.com/clack-corporation-control-valves.html