Gray Matters: Using Grey Water From Air Conditioning Units To Reduce Bathroom Water Consumption

Abrar Saleh AlTurkistani, Tahani Badeeb, Raneem Binismail

AlFerdous Private Schools, Jeddah, SAUDI ARABIA

Because we live in Jeddah which is located on the sea, the high temperature with relatively high humidity is dominant over the year which causes a big consumption of water for drinking and bathing. Moreover, the above average use of air conditioners produce a lot of gray water. Our method is to use the waste water, usually referred to as gray water, produced from the condensation of air conditioners found in the home. It will be very useful if we consider using this gray water for our needs in toilet water to save the purified water for other essential use.

To prove our hypothesis we have made two experiments:

• The first experiment: counting the amount of water consumed in toilet flushes by 30 persons in 4 days.

• The second experiment: Counting the amount of gray water released from 4 air conditions.

We have noticed after observing our first experiment that the total water consumption of five persons a day for a toilet flush is 149 liters.

From the second experiment we detected that using 4 air conditions for 18 hours in a 21degrees centigrade per A.C., the amount of water originating from all four air conditions is 118 liters. In other words, an air condition produces 29.5 liters when working in the exact period and circumstances.

We have concluded that the amount of gray water from air conditions cannot replace all the need of toilet flush but it can minimize it up to 78.9%.