Picture 6 represents a system for grey water recycling which deals with the water saving problem.
About 40% of freshwater coming into the average home is used just to flush the toilet. When tucked inside the cabinet below the bathroom sink, the Aqus system cuts that number significantly. Instead of using freshwater to flush, it catches the water that goes down your sink drain, filtering and disinfecting it and then quietly pumping it to your toilet tank. (The recycled water is even safe for toilet-slurping pets.) When there’s not enough wastewater for a flush, Aqus pulls from your plumbing. The system saves up to 14 gallons a day in a two-person house. An alternative for Aqus, which is easier and the nowadays household should profit on maximum, is a low consumption or dual flush toilet.