Green Plumbing

Answer: C - The toilet tank lid provides no opportunity for water conservation. The fill valve regulates the ratio of tank water to bowl water and determines how much water is needed to flush. The flush valve, or flapper, allows the valve to close when the tank has almost emptied its clean water into the bowl. The toilet water flow is a function of the bowl type, effectiveness of jets, and tank size. Updating any of these components will reduce water use.