Well... my black tank is higher than the gray tank... the gray being shorter and flatter under the shower - don't think gravity would work the way you want in my setup...
We definitely fill the gray faster - normally I leave that open when hooked up to sewer... closing it a day or so ahead of when I plan to dump the black.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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