Re: Head Backfill
There 2 anti siphon loops - 1 before the Electra San and 1 after. The system is under the v-berth forward and the loops come to the bottom of the berth. There is also a check valve after the macerator pump.
I hit the system with the muratic acid cleanse twice a year so it shouldn't be the joker valve. I don't know anything about it but it's not funny.
The flush is electric and runs for 30-45 seconds and leaves the bowl clean when done.
The head has overflowed in rough conditions - don't know whether it was just slosh or a lot of backfill. It did this with all the valves closed and the y valve diverting to the holding tank.
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