Green Plumbing

Answer: B - The graywater system requires pipes and/or tubing as the means of delivering graywater from its source to its final use. Pumps are optional given that many graywater-producing fixtures allow the use of gravity to deliver the graywater; in addition, they require periodic maintenance. Storage tanks require continual monitoring and maintenance due to the presence of bacteria-friendly substances in all graywater that can quickly lead to odors and contamination; such tanks are generally not recommended.