Personally, I like having a separate black tank, but I use the word "separate" loosely. It is one large tank divided into two compartments. I know the theory behind one tank is it just gives you the entire tank for all waste water, and, therefore, the ability to dispose of more gray water. That being said, I like the option of being able to dispose of my gray water without needing a dump station if I am in the wilderness. With one big tank I lose that option.
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