FIGURE A-1 The Mir humidity condensate water-reclamation system, which is planned for the early phases of the International Space Station. On the ISS, this system will be located in the service module of the Russian segment.

Source: Modified from Pierre et al. (1996).

stream of the multifiltration bed is used to determine whether the water is of acceptable quality (<150 microsiemens per centimeter [µS/cm]). A series of valves directs acceptable water to the conditioning bed, and unacceptable water is sent to a storage tank for recycling. Water that is accepted by the on-line sensor is processed through the conditioning bed, which adds magnesium, calcium, and other minerals to enhance palatability. Biocidal silver (0.05-0.20 milligrams per liter [mg/L]) also is added here for microbial control.

Conditioned water is heated (pasteurized) to 85°C by a heat pump (regenerative heat exchanger) and stored in a heated accumulator. Hot water is available to the crew directly from the accumulator; cold water is provided by rerouting the hot water through the regenerative heat exchanger (Samsonov 1996a).

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