Green Plumbing

Category - Water-Efficient Technology

All of the following are easy-to-implement potential uses for residential urban rainwater except:
  1. Toilet-flushing
  2. Landscape irrigation
  3. Water feature operation
  4. Car-washing
Explanation
Answer: A - Using rainwater for flushing toilets is certainly possible, however, it necessitates running new plumbing lines into the house in order to fill the toilet tanks. The other three options are all easy to implement with water directly from the rainwater tank and require no sanitizing or purification for use.
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