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Old 10-03-2017, 09:23 AM   #7
Rufus
Guru
 
City: Great Lakes
Vessel Model: OA 440
Join Date: Aug 2017
Posts: 904
When I re-plumbed the black water system on our boat I had two objectives in mind. Minimal water usage and a water trap (clean water in the bowl) to preclude odors in the boat. There's only one realistic solution and that is a riser immediately after the head discharge line. So the basic design is....head discharge...to riser (about 2.5 feet)....to vented loop...to downhill run to the tank. That meant completely rerouting everything. The risers/loops fit in the cabinets beside the heads so they're out of sight. The (mostly hard PVC pipe) lines to the tank required new elevated holes through bulkheads. Big effort, but worth the trouble over the long haul. Reduced water usage and no stink.
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