First of all ditch the stinky slinky and buy a Rhino Sewer hose. Makes what already is a simple job even easier.
I just can't see the reasoning or need to macerate an entire black tank of sewage thru a 2 inch hose.
I started to dump at a CG and heard this real strange noise coming from down a few sites. I asked what it was and a neighboring camper told me it was a camper that uses a macerator pump to dump.
I dumped and in less than 5 minutes was done, and put everything away and that camper was 'still' macerating away for another 10 minutes. Just really don't see the need for one. :R