Toyota's assembly plant in Baja California, Mexico, is one of a handful of Toyota sites around the world identified by the company as being at high risk for water availability. The plant uses a membrane bio reactor to remove solids from water that has already been used in the manufacturing process. This filtered water is then run through a reverse osmosis system to eliminate any dissolved solids. The plant is able to reuse water over and over again, which saves an estimated 23 million gallons of water annually.