The roof is part of an $18 million rainwater treatment system designed to clean 20 billion gallons (76,000,000 m ³) of rainwater annually, this saved Ford $50 million that would otherwise have been spent on mechanical treatment facilities.
The roof is part of an $18 million rainwater treatment system. This saved Ford. $50 million is an $18 million rainwater treatment system Ford. This $18 million rainwater treatment system was designed to clean 20 billion gallons (76,000,000 m ³) of rainwater annually. This Ford $50 million would otherwise have been spent on mechanical treatment facilities.