'Gris' is an incredibly cost effective water-saving-system which can collect all the water you use during a shower. You can reuse this collected ’greywater’ for flushing the toilet, cleaning the house and for certain washing activities. This way you can save at least 72 liter water/person/day in an average household which means at least 3.5 billion liter saved water per day in such an 50 million habitant country like Colombia.