At an undisclosed location in Los Angeles, I witnessed a demonstration of a simple greywater system. (The face of the perpetrator has been digitally obscured to prevent Central Services from capturing and imprisoning him for installing an illegal plumbing modification).
A garden hose is connected to the sink.
When the dishes are washed, the red knob is turned to shunt the dishwater down the hose, which goes under the floor and into the backyard.
It drains into a 5-gallon bucket buried underground, providing water for the banana and papaya trees, both of which bear fruit!