Reuse Your Gray Water
"Don't flush with the clean stuff"
1/4 of all water used in a house goes down the toilet
Standard toilets use 1.6 gallons per flush, while older toilets can use as much as 3.5 to 7 gallons per flush.
Storage and Reuse of household water could reduce water usage by 25%
Waste water from sinks, showers and clothes washers (collectively known as gray water) could be stored and pumped or gravity fed back to toilet tanks and reused to flush waste.