What's wrong with it?
Does the motor still run, but it won't pump anything...or does the motor not run at all? When the motor runs, but it won't empty the tank, it prob'ly only needs a new impeller. If the motor doesn't run, there's prob'ly nothing wrong the macerator itself...it's most likely an electrical problem--blown fuse...loose or corroded connection...bad switch...If it runs, but blows the breaker, it's prob'ly just clogged. Any of the above, you don't need a new macerator, you just need to fix the problem. If it's rusty, you prob'ly do need a new macerator.