It's all natural and self cleaning utilizing plants, sand, gravel and a waterfall that cascades down the side of the home. Are you kidding? And, they designed the waterfall to also act a screen to give privacy to one of the bathrooms. Genius. Here's a picture (below).
The craftsmanship and overall collaboration of design (from the inside, out) on this place is so well done.
This photo, in my opinion, just captures the whole experience of this place from the view to the indoor/outdoor living, to the eco friendly pool system. The private reflection pool in this shot cascades down the building and provides that screening (photo above). There's a ton more detail on both sites listed below.