Green Plumbing

Category - Water-Efficient Technology

Each of the following is a commonly-used type of filtration treatment product for on-site wastewater treatment, except:
  1. Carbon filtration
  2. Pellet filtration
  3. Reverse osmosis
  4. Sand filtration
Explanation
Answer: B - Pellet filtration is not a type of filtration treatment product for on-site wastewater treatment. Each of the other three responses is such a treatment product that successfully treats wastewater to levels suitable for varying uses (e.g., sand filtration for graywater for drip irrigation or toilet filling).
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