Practice Quiz

Green Plumbing

Category - Caring for Our Water

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What was one of the most effective water-saving toilet designs prior to the standards set in the National Energy Policy Act of 1992?
  1. Tank-reducer system to block part of the toilet tank’s water capacity
  2. Duoset system with two buttons for different water volumes per flush
  3. Pipe restriction system to slow the tank refill process
  4. Bowl water level monitoring system
Explanation
Answer: B - The Duoset system was developed in 1980 to allow the user to choose which of two water volumes to use for each flush. It is now used in both public restrooms and in-home bathrooms. Current models allow homeowners to save roughly two-thirds of their normal water use.
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