Astra WT 1815 is a superior quality, high-performance liquid aluminium sulphate based primary coagulant available in an aqueous solution. It is scientifically formulated for the treatment of a range of commercial, municipal and industrial process wastewaters and effluents. Astra WT 1815s excellent performance characteristics make it ideal for use in industrial effluent treatment including wastewaters from food, dairy, oil, textiles and chemical industries. Astra WT 1815 is an effective primary coagulant based on trivalent aluminium and is virtually iron-free. Astra WT 1815 is used for the treatment of potable water as well as process water, and sewage and industrial effluents. Aluminium sulphate works by neutralising the negative charge on suspended and colloidal matter to produce compact flocs suitable for easy removal by either settlement or flotation processes and promotes more efficient sludge digestion and dewatering.