Originally Posted by ependydad
I heard what you're saying and no - I'm not 100% sure, but I'm pretty positive. Their are 2 handles outside labeled "Waste Water". And inside, I have 2 separate indicators on my panel for Blk 1 and Blk 2 that showed different measurements (2/3 full and 1/3 full).
My panel also is labeled 2 black tanks and have 2 labels on the exterior as well that are labeled waste water.
My tanks from front to rear are as followed.
Tank 1 fresh water
Tank 2 gray water (bath sink & shower
Tank 3 black (toilet)
Tank 4 gray (kitchen sink)
Tank 5 gray (outside kitchen sink)
Now it is possible that your outside sink and rear toilet are tide together.
Hopefully Sabre Sam can clarify your units configuration.