ADWAN CHEMICAL INDUSTRIES Co Ltd., established in 1991, as one of the leading manufacturers and supplier of Water Treatment Filtration Media and Industrial Raw materials and inorganic chemicals. All our Filtration Media products (Silica Sand and Quartz Gravel) are natural filter media and carefully washed, oven dried, sized and graded to meet the exact specifications of ANSI/ AWWA B-100- & ASTM E-11. standards for chemically and consistently uniform filter media.