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Old 02-18-2018, 03:30 PM   #29
JRTJH
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Join Date: Mar 2011
Location: Gaylord
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Here, we use the sink and tub water to help flush (push) the toilet waste further down the plumbing run. If it were only toilet waste in one plumbing run and only sink/tub waste in a different plumbing run, it would take more water with each flush to push the toilet solid waste further down the pipe. So, functionally, it works "better" (saves water) to have all three connected to one plumbing run.

As for the shower in an RV draining into the black tank, I don't think that is very efficient. That would fill the black tank faster and would not "equalize" the fill rate for the gray tanks. Typically there are two gray tanks and one black tank. The kitchen sink drains into one gray and the shower/bath sink drain into the other gray. That way they would typically get full more equally than if the shower drained into the black and only the bathroom sink drained into the front gray tank.

There are ways to "equalize" the level in the gray tanks if they all use a common outlet to the campground sewer, but if there are two outlets, one for each gray tank, you're pretty much "stuck with what you got".... No way to equalize the level between the two tanks if they don't share a common plumbing connection.
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