Gris is a low-tech greywater-system for Third World Countries which can collect all the water you use during a shower. You can use this collected grey water for flushing the toilet, cleaning the house and for certain washing activities. This way you can save at least 80 liter water/person/day in an average household which means at least 1.5 billion liter saved water per day in such an 50 million habitant country like Colombia. Water consuption is a serious issue in Colombia. Usually the water usage is the biggest cost in the household’s overhead. In such a tropical country people use more water than in Europe. They take a bath 2 or 3 times a day, because of the hot weather. The other reason is that in Colombia an incredibly uneffective saniter-system has spread that use almost 8-10 liter of water for each flush.