The macerator pump allows me to dump, in this case, pump the waste from my tanks at home using my "sewer cleanout". If I have been dry camping, like I was last weekend, I don't have to search for a dump station on my way home, or on my way back to storage. Now, I can come home and dump both my tanks at my leisure. Since my sewer cleanout is about 4 feet higher in elevation than the street where my coach is parked I need the pump to push it up the driveway to the cleanout.
Ironically, my coach came with a macerator pump hooked up to the gray water tank, but there is no way to use that to pump out the black water tank. Not sure why that choice was made during construction.
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