Our experience has been that it is necessary to reprime the pump to keep it happy...often. As with most things on the camper, lack of use dries seals and rubber gaskets. So, we wind up repriming often.

I noted last spring at a Parliament rally one of their new coaches using the macerator only at a full service site. Kind of a different way of handling waste, as all you need is a garden hose and a 4" fitting.

Now you may know more than you wanted?