Supply of treated greywater from a treatment unit to reuse points: installed so drinking and other supplies cannot be contaminated, uses set by the utility, health and environment authorities, a backflow device at the drinking water meter, low-hazard devices on external drinking taps, backflow protection on any top-up from another supply, Section 2 materials and installation like non-drinking services (2003 Section 9A).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.