This thesis is about a smart water system which can have a direct and indirect effect for the improvement of life on the street. The street of San Joan; situated at the center of Barcelona; is primarily residential and sits on an immediate gradient of 1:50. The data we have collected here states that within the area of 90Km2  the municipality daily consume approximately 30’ 000 liters of tap water while coincidentally about 2.8 Million liters of potential grey water is available from the surrounding residential buildings- enough to produce around 37’000 apples a day! Our primary criteria, therefore, was to integrate a smart sensor system with an infrastructural branching water purification system (called ‘Phytodepuration’ alongside such natural systems as hydroponics) which would require gravity as a metabolism for keeping water flowing. Thus the gradient of our site would enable the system to grow vegetation and flora according to the participation of neighboring grey water outputs.  Didactic Information would then be given to residents and general public on the quality of their grey water both through digital methods and analogue ones with means of improving it. Whereby residents are encouraged to use non pollutant products sold in the previously closed down outlets to see greener results on the street. At the same time where necessary, the municipality, would be able to see how much water they can irrigate with. As the system improves, local restaurants and residents would be able to harvest from the produce and permaculture workshops would be introduced to reap from all the benefits of the smart filtering recycled water. Click for presentation!