Save the cold
Just because is cold doesnt mean that you should dispose it

Solution

My proposal attacks the water use reduction (3rd category). It promotes to use less water, or use it properly. (for the plants for example)

I am designing a device to actually collects the cold water from showers. Before the warm water comes along, the cold water is wasted. With a device designed for this (no buckets, but something that offers a added value) we can use this water for anything: is totally clean and usable!

Buildings covered: Existing schools, hospitals and apartments complexes.

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