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The paper discusses the 13.5 year flight operation experience of the orbiting space station Mir's water supply system (WSS) comprising a regenerative system and a water storage system. The basic water recovery system operational data are analyzed. It is shown that stage-by-stage introduction of additional recovery systems and updated units during its operation allows the system performance to be improved considerably and its functions to be expanded. Data on the quantity and quality of the water processed are presented including the economic efficiency of water recovery aboard the OSS. The experience in international cooperation of water management is described. It is shown that an updated water supply system of the Russian segment of the International Space Station fully accounts for the experience gained in development and operation of Mir's WSS.

A Simulation model for a distillation unit which is based on the description of some hardware by hydrodynamic patterns of “ideal mixing” is developed for solving problems of prediction of the Water Reclamation System from Urine (WRS-U) operation. The model reflects the system operation algorithm and enables simulation of process hardware. The structure of the Simulation Model (SM), formalized descriptions of some units and model program implementation are shown based OSS Mir's WRS-U. Computational results are compared with test data.