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Decreasing water resources is a worldwide problem and access to clean water is costly for every household, especially in South America where people tend to use inefficient sanitary systems and take showers more than once a day due to the warm climate. 'Gris' is a low-cost water-saving system that collects all the water during a shower and can reuse it for flushing the toilet, cleaning the house and other washing activities. This can save at least 72 liters of water/person/day in an average household, which means at least 3.5 billion liters of water saved per day in such highly populated countries as Colombia (50 million inhabitants).