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Re: Mascerator Pump or Diaphram Pump?
We have a Lavac toilet that is served by a manual diaphragm pump (Henderson Mk V, now Whale). That pump creates a vacuum to draw in raw flushing water and evacuate the bowl. From there it goes to the holding tank or directly out (when more than 3 miles offshore, of course). To pump out the holding tank (also 3 miles offshore) we have a macerator pump. At that point, everything has already gone through the manual diaphragm pump at the toilet, so it is not apparent why a macerator is even needed. In other words, a diaphragm pump would work here.
In any case, the macerator pump has been a PIA and I’ve replaced it twice in 22 years. The primary cause is running the macerator dry and trashing the impeller. You could rebuilt the pump, but replacing it with one supposedly longer run dry time seemed a better solution. BTW, it isn’t always easy to determine when the macerator pump has begun to draw liquid from the tank—hence the run dry problem. A diaphragm pump would be the more reliable solution IMHO.
P.S. The Lavac system has never failed and has to be one of the most reliable flushing toilets in the world.
Last edited by fallard; 01-01-2019 at 10:04 AM.
Reason: Added info