This Vertical water storage tank is made of food-grade polyethylene which makes it ideal for water storage. This 2-layer and three-layer tanks comes with an inner layer of blue tone white and an outer black/ blue layer. The outer layer is UV stabilized to mitigate the harmful effects of sun rays and the inner layer is safe to use for potable drinking water. Sagar Great water storage tank is round in shape and medium in weight and is designed to sustain natural weather conditions. The durability of the Sagar Great tank is very reliable as it is built to withstand Indian standard weather conditions.