Asphaltene Balck is specilly formulated wit hmon toxic special type bitumen binder wioth inert fillers having excellent water resistant proiperties. It can be applied on MS , concrete and PVC interior walls of water tanks. It forms a non-porous film on concrete so that it cannot breathe in any outside contamination. It prevents the formation of fungi or algae, thus keeping the water fresh, pure, crystal clear and fit to drink.