On my way for a short overnight Boondocking stay. Full tank of water, but forgot to put any in the black water tank. I'm assuming there should be a little in there to start with?
Most CG folk will tell you it's important to use ample water when flushing (add as you go type mind set), but for boondockers it's pretty much the opposite since we are so dependent on our FW tanks.
Personally, I fill my black tank about 1/3 to 1/2 full before setting out (and GEO chems). That allows less water expenditure per flush from my FW tank when I'm out and about. I use minimal water from my FW when flushing and have been known to use a spray bottle to help expedite #2's. "Shtuffs" still become soluble and flush easily without having to tap into my oh so precious FW tank.
It doesn't matter how much you use per flush so much as how much is in your tank for solubility and easy expulsion. The exception to that would be in the design of your septic plumbing. Ie.. straight drop into your black tanks will require less water to flush over a piped bend. KWIM?
In a nutshell.. yes.. I would always want to have "some" amount of water in my black tank before setting out.
Aways have 2-3 gallons of water back in after I dump.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
Any suggestions for places to get water when traveling? Rest stops didn't have it
Some truck stops have some services to RVs, such as Speedway or TA's I've seen fresh water standpipes at some stops. Most state parks also have water services available.
__________________
Mark, Vicki, & Scout THE dog
2015 Hemisphere 282RK
2016 GMC 3500HD Duramax dually
1992 Goldwing Aspencade