Which fixtures contribute to gray water systems?

Gray water systems are designed to recycle and utilize wastewater from specific plumbing fixtures that do not contain human waste, which is typically handled by a separate black water system. Hand wash sinks and showers are prime examples of fixtures that produce gray water, as they generate wastewater that can be reused for irrigation or other non-potable purposes.

Hand wash sinks produce water that may contain soap and skin particles but is generally free of contaminants associated with human waste. Showers, similarly, create wastewater that is primarily soap and dirt. This makes gray water systems ideal for capturing such flows, as they can be treated and reused efficiently.

In contrast, toilets and sinks producing black water are not appropriate for gray water systems due to the presence of sewage and human waste, which require different treatment methods. While dishwashers and kitchen sinks do create wastewater, they often contain food particles and grease that complicate the treatment process, making them less suitable for inclusion in gray water systems. Therefore, the correct choice emphasizes fixtures like hand wash sinks and showers, which align with the principles of gray water reclamation.