How do paragraphs 7-9 contribute to the development of ideas in the text

well if u read the book you would know that she meant to

greywater is gently used water from your bathroom sinks, showers, tubs, and washing machines. it is not water that has come into contact with feces, either from the toilet or from washing diapers. greywater may contain traces of dirt, food, grease, hair, and certain household cleaning products.