And so what you might be saying?!
Well the significance is that our bodies consist roughly of two thirds water and thus a continual intake is vital for survival. You could live on average between 3 to 7 days without water (depending on environment) but as little as a 10% fluid loss is likely to prove fatal if not treated immediately.
Therefore a unit like the water recovery system becomes hugely significant for the long term success of not just the ISS, but also for future space missions such as those proposed to Mars. The aim is to capture and recycle every possible drop of water used on the space station, including that used for washing, shaving, teeth brushing, collection of sweat and water vapour collected from the the astronaut suits and the station atmosphere, plus, (and with the greatest yuk factor) the recycling of crew member urine!
The urine first of all goes through a distillation process before merging with the rest of the recovered fluids in the water processor. Solids such as hair are filtered out and then the liquids go through a series of multifiltration beds, removing contaminants through adsorption and ion exchange. Any left overs in the water like non absorbing organics and solvents go into a reactor that breaks them all down to carbon dioxide, water and a few ions. And as if by magic you once more have water fit to drink!
Fancy a cup?