If indeed it is a Jabsco
Quiet Flush something is wrong. The good news is that it should be a simple fix -- there aren't many parts
. I suspect either: the joker valve installed backwards as noted above, the blade on the macerator slipping on the axle, or a kink in the outlet hose.
Note that this toilet does not require 3 gallons per flush. The spec for pressurized flushing water
is 3-1/2 gallons per minute. It takes 5 seconds or less to flush, so a quart or so per event.
The failure mode for inadequate pressure water
is benign - you just have to pump more water into the bowl before flushing
A proper installation
has power to the flush water pressure pump connected to the flush button module (three buttons: flush water in only, flush water in/flush out, flush out only) so there is no pressurized sea water in the boat in the normal course of events
The Quiet Flush is also safe to install with selectable fresh or sea water flush, a great convenience allowing the use of fresh water (reducing head
odors) when water is plentiful and sea water offshore
I've been using mine as a liveaboard
for a year and a half. It clogged once (a visitor had to try really really hard to get enough paper in there to overwhelm the macerator). Clearing the clog was trivial compared to conventional toilets and took only ten minutes. I was ambivalent about it when I bought the boat but went with the factory recommendation. I'm now sold.