The Water Processor Assembly (WPA) and the Oxygen Generation Assembly (OGA) form part of the complex regenerable Environmental Control and Life Support Systems (ECLSS) on the International Space Station (ISS). The WPA processes humidity condensate from astronaut perspiration, on-orbit experiments, crew hygiene and urine distillate into potable water. The OGA uses electrolysis to convert water from the Water Processor Assembly (WPA) into oxygen for crew consumption and hydrogen.
The WPA processes approximately 20 lbs/hour or 2 ½ gallons of water per hour. The OGA system produces up to 20 pounds of oxygen per day, enough to sustain six crew members indefinitely on the ISS. These technologies are essential for long term space exploration, minimizing the need for resupply of oxygen and water.