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).