When desalinating seawater using reverse osmosis membranes, the high-pressure pump consumes more than 70% of all energy used in the desalination plant. Ever increasing energy prices force the desalination industry to focus on overall power consumption of the high-pressure pump and the total Sea Water Reverse Osmosis (SWRO) plant. Since the introduction of Energy Recovering Devices (ERD) for large plants, energy consumption per in 3 water produced has been reduced to such degree that nowadays it is possible to produce drinking water in large plants using less than 2 kW h/m(3). The manufacturers of ERD components have not focused on small plants producing up to 100 m(3)/day. Few technologies are available for small plants but despite considerable energy savings, these technologies are unprofitable. Development of the Danfoss high-pressure Axial Piston Pumps (APPs) has provided new attractive possibilities for reducing energy costs considerably while simplifying the plant setup at the same time. Danfoss' mind-set comes from 45 years of product development within the oil hydraulic industry. This experience enables small plants producing as little as 0.2 m(3)/h to reduce their energy costs by more than 50%.