Collecting sink water

This is a variation on the "bucket under the sink" system. In this sytem the P-trap is disconnected and turned to the side. Note: It is very important to keep the trap filled with water and to protect it from evaporating- the water prevents sewer gasses from entering the house! The sink drain outlet is connected to a tube with a hose clamp, and the tube diverts the water into a container.  The greywater is then used to bucket flush the toilet.