How a Macerator Pump Works A macerator pump takes waste from a toilet, sink, and shower, breaks it down into a liquid, and pumps it to your home’s existing waste line, even when the bathroom is installed below it. The Lift Assure macerating system uses a 3-port design to process waste instantly and move it upward through a single outlet. Because it doesn’t rely on gravity, a macerator pump makes it possible to add a bathroom in basements or other hard-to-plumb spaces without cutting concrete. It