Builder's Gray Water Guide: gray water systems in new construction or remodeling. Includes gray water regulations, dealing with inspectors, legal requirements checklist, sample permit, treatment effectiveness studies.
The Sloan® AQUS™ Greywater System puts bathroom sink water to good use. This system filters the water that goes down your sink drain and then uses it to flush your toilet, saving thousands of gallons of water annually.
I like the article as it shows how he's adapted to their local situation an climate. His post: Constructing a new house? Prioritize rain water harvesting and grey water recycling systems over fancy marble tiles