Reused grey water must NOT be used with which of the following?

The reuse of grey water is an important practice for water conservation, yet it comes with specific guidelines to ensure safety and hygiene. When considering the use of reused grey water, it is essential to remember that grey water typically comes from sources like bathroom sinks, showers, and laundry, but should not be used in scenarios where it can cause cross-contamination or health risks.

In this context, using reused grey water with an exterior hose bib is discouraged because it can lead to issues with contamination of potable water supplies. Hose bibs are commonly connected to the drinking water supply, and if grey water—which may contain soap, food particles, or other contaminants—were to backflow into the drinking water supply, it could pose significant health risks. Ensuring that only clean, potable water is used in drinking applications is crucial for public health reasons.

Using grey water in bathroom sinks, toilets, and dishwashers can be more acceptable because these applications typically do not pose the same risk of contaminating potable water supplies directly. However, each application has its own regulations and best practices, so it's vital to be aware of local guidelines concerning grey water use.