The system units are modular and compact. They come in containerized units and each has its own controls allowing them to be operated independently. The systems are easy to install, have low maintenance and minimal energy consumption. The system combines membrane separation and distillation with hydrophobic membranes and differences in vapour pressure. The Vacuum Multi Effect Membrane Distillation configuration used in the system adds the advantages of low-temperature operation and multi-effects to the membrane distillation characteristics. This opens up a wide range of applications with high recovery ratios and pure distillation production, all powered by low grade heat.