How do you long termers handle grey & black water?

IDoMyOwnStunts wrote:
I do that with a Flush King, but slightly differently. My grey tends to fill much faster when we have FHUs, so I almost always have a black tank at 1/3 when my grey is full. I just transfer some grey into the black and re-close both valves instead of dumping the entire grey. That usually nets me an extra day of grey use. Plus more water sitting in the black is better.