thanks for the advise guys - very helpful.
I think the best idea/system someone mentioned is a holding tank mounted high - then open a valve and let gravity do the work
.. In fact Chris White designs them so the valve mounted on the bottom is directly below the pump out line. So if there is a blockage it can be poked thru from above.
I remember seeing the Kontiki raft as a kid - they had a toilet seat strapped to the side. So easy back then...
But, that is not what I currently have.
I have uploaded a sketch of the current
Just to clarify.
This is a fresh water system. So there is no salt water
intake and associated problems.
The waterline (even drastically healing) is at about the base of the toilet bowl.
When I mentioned vent line. I'm referring to the vent from the holding tank - 5/8". The two 1 1/2" discharge lines do not have a vented loop at the high point.
The vent requires relocation and an appropriate rising run without dips. This I will definitely do. It will pass thru the bathroom, instead of the bedroom and engine
room. And exit on the deck adjacent to the pump out fitting.
The two 1 1/2" discharge lines loop under the bed
. I can relocate to the bathroom. That would be better, and no different function.
But, I am trying to simplify if possible.
Are the loops necessary in the pump discharges of the vaccuflush unit and the holding tank unit?
There are no vented loops in the top point of the loop. Does that make them pointless for an antisyphining system?
They would provide a safety for flooding if there were catastrophic failure of the main components below deck. but not necessary for an above the waterline toilet bowl.
Closing the valves regularly is not an option.
BUT, neither of these lines are being used at the moment.
The holding tank discharge should be kept closed at all times, except when discharging overboard. So for safety of flooding, and not accidentally discharging, it should be constantly closed. So the loop and 20' of hose per hull can be eliminated.
The other should be kept closed at all times except when the holding tank is not being used. So, as someone mentioned, I could use the holding tank at all times. And pump out once per day or so when "in the bush". So I will eliminate that hose run too (and another 20' of hose per hull).
That would be a total of 80' of 1 1/2" head hose eliminated from under the bunks.
What do you guys think?
Does this seem practical?