swimmer_spe wrote:
but i do not know the condition of the tank and lines and would rather not use it.
Why do people make things harder than they need to be ????
How difficult would it BE to run 10 gallons of water into the grey tank, let it sit for a few days and then dump it out to ACTUALLY SEE what comes out ???? You could even put a splash of bleach and a squirt of detergent into your "test water".
The odds are overwhelming that your tank will be just fine to use straight through.
And then it will still be usable if you move the rig or the rules change.