Whether you should depends on
whether you can legally use it. In the US, you must be at least 3 miles offshore to dump a tank. That's NOT just 3 miles from nearest shore in a lake, bay or sound...that's 3 miles out to sea from the nearest point on the whole US coastline (6, 9 or 12 miles out in the Gulf in some parts of FL). As for how to do it: break your pumpout line near the tank. Install a y-valve--one side going to the deck pumpout fitting... the other side goes through the macerator, up and over a vented loop, and out a below-waterline through-hull that should ALWAYS remain closed except when actually dumping the tank. Follow the directions that come with the macerator to wire it. Before someone asks why a y-valve instead of only a tee or wye fitting...a y-valve--which should always be aimed toward the deck fitting except when actually dumping the tank--is not only a back-up fail-safe for the seacock, but allows you to cut off the flow of waste to the macerator to replace the impeller...impellers NEVER fail when a tank is empty. So why not just put the macerator above the tank? Because the further away from the tank discharge fitting it is, the longer it takes to prime...and the longer it takes to prime, the longer the impeller has to run dry...and running dry is what fries impellers.
