Friday I went to help out at Pueblo Solar. It´s a branch of Casa Zen being built 5 miles south of Isla Piedra (and Mazatlan). The project is intended to be an energy self sufficient retreat center. Roberto (pictured) and I worked on building a septic hole (fosa septica) for the toilet drainage. After finishing the hole we poured a layer of gravel into it. Then we went to collect dried out coconuts to create the next layer.