Hey! I have an issue I've been trying to resolve around water entering the head through the toilet when it is on the low side tack.
Setup - Inflow - Through hull seacock to strainer to ball valve to head.
Outbound - Head to macerator pump to check valve to Electrosan w/2 vent loops to 3 way valve to overboard seacock OR to holding tank.
All is good when the boat is flat or head is on the high side. I've tried shutting everything and diverting to the holding tank but I still get waste water in the head on the unfavorable tack.
I've replaced the ball valve and the check valve - still the same. Thoughts?
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