Were both McCarthyism and the Salem witch trials left many innocent victims in their wakes

a is the indefinite article

i would need to know the specific part of the passage your referring 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.