Grey water toilet and flushing method

A grey water trapway system for a toilet, the grey water trapway system comprising:

• a trapway passage curved portion;
• a trapway passage down-leg extending from the trapway passage curved portion in a substantially vertical direction;
• an inlet opening configured to supply grey water to the trapway passage down-leg;
• and
• a trapway passage horizontal portion extending from the trapway passage down-leg to an exit to a drain pipe.

A grey water system configured to be in fluid communication with a trapway of a toilet, the grey water system comprising:

• a collection device configured to capture water from at least one appliance;
• a pump configured to cause the captured water to move from the at least one appliance to a storage tank, wherein the storage tank is connected to the trapway of the toilet through a first path and connected to a drain pipe of the toilet through a second path;
• a pipe configured to couple to an outlet of the storage tank and couple to a trapway of the toilet, wherein the trapway comprises:
• a trapway passage curved portion;
• a trapway passage down-leg extending from the trapway passage curved portion in a substantially vertical direction;
• and
• a trapway passage horizontal portion extending from the trapway passage down-leg to an exit to a drain pipe.