The potential for reuse of household water for garden irrigation is great. Of all the water used in an average home, 55 to 60 percent is classified as greywater, while 40 to 45 percent is listed as blackwater. Blackwater is toilet water is best not to use it. However, treatment and reuse of greywater is possible. Greywater comes from the kitchen, laundry, shower and bath. It contains grease, food particles, soaps, detergents, hair, dead skin, bacteria and viruses and anything else that goes down the drain. The main concern about using greywater is the possible health effects on plants and human life.