The modern method of lining industrial lakes, regardless of their size, area or depth, is constructed directly on sand or soil without the interference of any concrete or construction materials, with all electromechanical work related to the process of moving and filtering water, and this is done on sand with the presence of inlet connections and exit of water. The lining is then made with polyethylene, which is the material of insulation and the final form of the lake at the lowest construction cost with increasing the life span of the lake for more than 30 years.