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post #10 of Old 07-13-2010
Maine Sail
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Originally Posted by ajf10 View Post

Is the only solution to install a vented loop between the holding tank and head?

Originally Posted by ajf10 View Post
Or, is replacing the joker valve enough to prevent backflow?
No, it won't always prevent back flow.

Originally Posted by ajf10 View Post
There is no overboard pumpout in the circuit, so siphoning of seawater is not a concern.
But siphoning effluent into your cabin is okay?

Originally Posted by ajf10 View Post
I would rather not have to drill a hole in the topsides for the vented loop to vent overboard.
No hole necessary vented loops DO NOT need to vent overboard. They break a siphon via a check valve that opens on suction and closes on pressure.

Originally Posted by ajf10 View Post
I am also concerned about how difficult it would be to empty the toilet completely with the vented loop in place, since the toilet doesn't seem to pump water through very well as it is.
Considering this is a fairly standard industry practice your head should pump it just fine IF it is working properly. Make sure your intake line does not have a siphon break/vented loop in the INTAKE line. It should be between the outlet of the pump and the back of the bowl and working on the pressure side not the suction side.

-Maine Sail / CS-36T

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Last edited by Maine Sail; 07-13-2010 at 03:55 PM.
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