NOVELTY - Method of cleaning water to grow algae comprises: measuring a flow rate of water coming out of an abandon mine discharge (AMD) to determine the size of holding that are needed to grow algae; measuring the levels of elements in the AMD water; adding artificial light if sunlight is inadequate; adding heat to the water if required; adding algae to the water; removing oxygen gases in closed loop systems caused by algae emissions; removing matured algae; and introducing treated water back into the environment.    USE - The method is useful for cleaning water to grow algae, which is useful for producing biodiesel fuel (claimed). The method is useful for producing a renewable energy feed stock. The method is useful to remove heavy metals to clean water, reduce carbon dioxide levels and oxygenize the water so that aquatic life can live.    ADVANTAGE - The method does not require the addition of costly nutrient chemicals to the water. The method utilizes the dissolved metals as nutrients from the mine water, which is more cost effective to produce the algae. The method produces copious quantity of algae. The polluted water provides highly favorable conditions for the rapid growth of algae, which shows great potential as a worldwide energy source. The algae have very high oil content; the ability to thrive in most climatic conditions including polluted waters; and the ability to produce tremendous volumes of plants per acre. The method utilizes free pollutants from mine acid drainage, which provide the ideal conditions for algae growth and hence there is no need to add nutrients and gases for maximum growth. The method produces renewable energy feed stock at low cost.    DETAILED DESCRIPTION - Method of cleaning water to grow algae comprises: measuring a flow rate of water coming out of an abandon mine discharge (AMD) to determine the size of holding that are needed to grow algae; measuring the levels of elements in the AMD water to determine if any are lacking for optimal algae growth; adding artificial light if sunlight is inadequate; adding heat to the water if required; adding algae to the water; removing oxygen gasses in closed loop systems caused by algae emissions; removing matured algae and repeating process if necessary to remove more of the metals and other undesired element; and introducing treated water back into the environment. An INDEPENDENT CLAIM is included for producing biodiesel fuel from algae grown on mine acid drainage ponds comprising: growing algae on a pond or in a commercially available photoreactor tube; harvesting the algae from the pond; removing the oil from the algae; and using the algae oil as feedstock for conventional production of biodiesel fuel using a base catalyzed transesterification reaction in conventional biodiesel reactor.