Originally Posted by raoulwv
I personally prefer to leave the grey tank valve open or else I would be dumping it every day. I close the valve the night before I plan to dump the black tank, so that there's enough water to rinse the stinky slinky. Always leave the black tank valve closed until at least 2/3 full.
Agreed- we do the same thing.
We use our shower for 1-4 showers per day and when we have full hookups prefer to not
do the Navy Shower thing. On top of that, we seem to take longer showers. 2-3 showers and our gray tank is ready for dumping (heck, even with the navy showers- we still seem to fill it quick!). So we leave the gray tanks/valves open for the kitchen sink and shower.
I do try to close them the morning that I know that I'm going to dump my black tanks to have some extra in there. But with my black tank flushing habits, there's not much of any nasty water flowing through the stinky slinky when I'm done any way.
And as mentioned, always leave your blank tank closed until you're ready to dump.