1. Sulzer Pumps Ltd., Pump selection tool, http://www.sulzerpumps.com/DesktopDefault.aspx/tabid-1246/.
2. Hydranautics Corporation, IMSDesign software, http://www.membranes.com/index.php?pagename=imsdesign.
3. IDA World congress;Sanchez Sanchez,2007
4. Energy Recovery Inc., ERI SIM V1.2 http://www.energyrecovery.com/tools/px-eri-sim.php.