meet Gris: a water saving system for the real world

'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.
The problem is that generally graywater-systems are too complicated and too circumstantially can be installed – in some cases you need to rebuild your complete saniter-system in your house. Besides most of them are incredibly expensive (1000-15000$).
The other big problem is that due to climate change in South-America the dry season in the last decades became longer and dryer that is critical, because it leads to serious social conflicts. In many smaller towns and villages the water network is supplied by local water reservoirs and when there is very few rain the water resource decreases. It occurs many times that farmers who lives closer to the water reservoir hijack the water flow to give water the animals – however it is unethical to the community but if their animals die the farmers will starve to death either. This creates such hard to solve conflicts that endangers whole communities.
How it works?
Generally during a shower we use an average 40 liter of water each time. The concave form of 'Gris' collects allmost 90% of this water. It also has a non-slip granular surface to avoid falls by slip.
'Gris' is divided into 4 interlocking cells. After a shower you can easily lift up only the one you need to use without moving the whole 40 liter mass.
Each cell is 10 liter which is the same size of an average domestic bucket - so housewives will be able to handle that weight too. This way you can easily flush your toilet with one unit or if you use proper shower gel you can also irrigate your graden with it.
MOME project
Designer: Alberto Vasquez
Design consultant: Attila Barkanyi

Registered Design at Hungarian Intellectual Property Office (HIPO)
If you'd like to learn more about Gris water saving system, please contact us at

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