Ours has a black tank only. The galley gray water enters it from a top fitting/tank vent . The toilet sits directly on the black tank. There is a three inch shut off valve at the tank.
The wet bath sink and shower drain is plumbed into the black water discharge pipe apparatus after the black tank shut off valve and can be closed off with a second two inch valve.
I'm thinking the habit is going to be to either keep both valves open or not to open the wet bath valve until taking a shower. The bath sink cannot then be used also.
I don't have black tank level monitors so I'd have to keep an eye on usage .
Also, I have read about and watched about refreshing of the white water system. No harm in looking into the tank to see whats alive in there. The bleach and or baking soda solutions should probably be done as a maintenance item anyway.
Work in progress
Regarding an earlier post, I tried real hard to change over to the 16's but it didn't work out within my time frame. So I pulled the trigger on seven of the 16.5's from Firestone.
These will work forever and a day and I feel totally safe with them. Nice tire. I will be finding myself checking pressure more often but as long as more than 40# are in there I have no fears. The mudder boyz who air down to the teens have the most trouble. But at that , even a safety bead rim can pop when down low. Just my thoughts.
