Join Date: Mar 2008
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In my system, which I designed so blame no one, the tank itself is below the water line. The hose from the thruhull to the pump (and then tank) is also below the water line. It is that 1" hose that would need a anti-syphon. As it is the seawater can leak by the pump, slowly but it does and then fills the tank.
In my case the hose from the head is a bit higher and seems to be just above the waterline but I would expect the seawater to fill that hose as well.
So with the valve left open the only thing preventing the boat from sinking is the hoses and fittings connected to the tank, the tank itself and the valve at the toilet which is not designed for that so I would expect it to leak or fail first. A failure of any of those items that result in water coming in at a rate higher than the pumps pump it out gives Davy another ship.
If the 1" hose from the mac pump was to rise to an anti-syphon device all that could be avoided.
BTW when I bought the boat the thruhull was left open. The tank was full. It was an old aluminum tank and I found a spot so weak I could break thru the tank with my thumb. That is all that kept the boat afloat (if the pump had failed).
Have faith that the oceans are going to rise and flood the world, that plague and pestilence brought on by Climate Change is going to punish us for not believing. Please do as they say it is our only hope. :P