I recently replaced my Macerator pump and have tested it. I have a dedicated garden hose (do not try and prime this hose using your mouth) and a connection on the curb side of the third bay. Switch in the Plumbing bay that once on stays on until one turns it off (witch is why I replaced the pump). There is also an electric valve that opens to allow both the grey and black water to combine and exit together. I have been considering a longer hose to reach remote sewer locations, wonder how long is too long and how much of a grade the pump can handle, might test this w grey water first.