The treated Graywater can be reuse for indoor purpose like laundry, toilet flushing and car wash. According to [3] toilet flushing and clothes washing are the biggest users of water in any house, and about “70 liters of drinking water and 44 liters of waste water can be saved per person per day”[4] by the treaded Graywater method. The treatment processes for Graywater include three main stages: screening, pre-treatment, and treatment. First, the gray water is filtered and stored in a tank. The storage tanks is designed so the large particles settle down at the bottom, while the oil and grease rise to the surface. Then the water is pumped through an aerobic process then chlorine and iodine are added to aid in microbial digestion. Those chemicals
