||When wastewater enters the water processor a liquid separator removes the gas bubbles from the liquid. Then gas and water can be treated separately, which simplifies the equipment and processes needed for the
||Once the gas is removed the water is filtered like coffee in a coffee filter. All particles with a diameter larger than 0.5 micron are trapped in the filter, like the
grinded coffee in the coffee filter. (For comparison: the average thickness of a human hair is about 10 micron.)
||After this step the water is forced across a surface containing sorbent and ion exchange material. In this step most of the
contaminants are removed from the water.
||Then, there are only some tiny molecules left that need to be removed before the astronauts can re-use the water. These molecules are removed by heating the water
to more than 100ºC and then flown across a catalyst.
If there are still particles left after having been through this filtering process, the water goes through it again after
cooling down. When the water gets out of the water processor on board the ISS, it is cleaner than the water most of us drink