A macerator uses an electric motor to grind up solid waste from the black tank enabling it to flow easily through a smaller hose. The electric motor also allows you to empty the black tank even on an uphill incline since you aren’t relying on gravity as is the case with a traditional RV black tank system. Some RVs come with macerators, or offer them as an optional upgrade. RV macerators can also be installed aftermarket. Many users appreciate the more streamlined hose and dumping process. The most common complaint is not being able to leave the gray tank valve open when parked at a full hookup campground, since you only connect the macerator hose while emptying your tanks. However, many RVs with macerators also have a traditional sewer hookup option that you can use when it is more convenient.