The tour of Ecofiltro is incredibly informative. I learned so much about the water problems affecting Guatemala and how Ecofiltro are supporting rural communities and schools. Ecofiltro's water filters really are a revolutionary product for Guatemala's water situation and it was amazing to hear about their evolution and to see them in production. The co-founder, Philip, was the tour guide too. He was really enthusiastic and so knowledgeable. Ecofiltro also support a number of local artisans who create unique designs for the water filters, which you can see during the factory tour as well. I'd definitely recommend visiting this org if you're in the Antigua area and interested in learning more about the socio-cultural and environmental issues affecting Guatemalans.