gray or black
I have never put anything but soapy water down the sink. I put every thing else down into the black tank. Anyone drain canned food juice into the sink? Wonder if I am taking it to far.
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Use it like your sink at home with no garbage disposal. No Grease and as little food as possible. Small amounts will wash out. I always keep the grey water closed and flush it open it at the 3/4 full point.
