Originally Posted by
Petervs
The reason you want a macerator pump is:
To empty the tank at a location that does not have a normal sewer connection. Maybe you are staying at a friends house and the tanks are full. You connect a garden hose ( one specifically designated for this duty only) and run it into the house and right into a toilet or washing machine drain . Turn on pump, problem solved. You can pump it 5 to 10 feet higher than the tank outlet, so you have many more options than just running onto the ground.
You can also use it to empty the gray tank ( if you have separate tanks) since it always seems to fill up first. You can just run it into the bushes , away from the coach by the distance equal to the length of your hose. It beats just dumping on the ground under the coach.