The Danfoss range of APP high-pressure pumps is designed according to EN 809 for use in RO applications with low viscosity and corrosive fluids such as: Sea water, Brackish water, Waste water (APP W).Danfoss APP pumps are positive displacementpumps with axial pistons that move a fixedamount of water in each cycle. Flow is propor-tional to the number of input shaft revolutions(rpm). Unlike centrifugal pumps, they producethe same flow at a given speed no matter whatthe discharge pressure.