grey water use

[Damn Yankee]

I think that would be a great idea if you dry camp a lot. The kitchen sink is considered a black water source cause of oil & food waste so I'd send that to the black tank. Send water from the shower and bathroom sink to the gray tank, add a sediment filter, pump and your in business. If your just looking for extra gray water capacity you can join the tanks together at the top so when the gray tank is full it will flow over the black tank.

[HighTechRedneck]

Send water from the shower and bathroom sink to the gray tank, add a sediment filter, pump and your in business.   If your just looking for extra gray water capacity you can join the tanks together at the top so when the gray tank is full it will flow over the black tank.

When doing this, be sure to put a valve on the cross over so that transfer only happens under your control.  Otherwise, if the black tank filled first and overflowed into the gray while you were reusing the gray to flush with, the odor could be quite offensive.