International Space Station Water Balance Evolution

The International Space Station (ISS) water balance is evolving throughout the assembly phase.

The ISS and its environmental control system become progressively more complex as new modules are added. This build-up results in various forms of water supply and water consumption rates. The Russian and United States water balances are integrated to form an ISS water balance. The changes in the water balance as the ISS grows and as the crew complement changes are discussed. The actual versus predicted usage rates are shown through each expedition crew.