Guys - note that the people behind this project (EMAS - Wir machen Wasser zug) have been perfecting this "technology" and transferring it to Bolivia (and other places worldwide) for over 20 years; it seems sound, and likely is much better than what the people in these areas are more accustomed to (buckets from the river?)...
The music does get changed up on the videos, but it all has that flavor - I imagine its because it is to give it a local (Bolivian) interest; on some of the later videos (especially the ones on solar energy) I wish there was more of the english over-titles like there are on the other videos, but then again, these videos aren't meant for me, either...