These Guidelines for Greywater Reuse are developed to raise awareness of the importance of benefiting from graywater recycling, by introducing how to treat and recycle graywater for using it in flush tanks and agriculture and the best method for this treatment.
Graywater is the product of the used water, except for toilet water. It is precisely the washer water, bathing water, laundry water, kitchen water, etc. It is not recommend to connect the kitchen drain water and the water of the dishwashers to the graywater tank because it contains fat, oil and food residues as they increase the processing requirements and costs.