As for the fresh water side, I added the antifreeze into my fresh water tank & seems that's not what it's designed for?
We only used it for washing our hands & dishes & using the toilet.
For cooking & drinking we used bottled water & the dog got tap water we keep in a 3 gallon bottle we always try to keep topped of for him.
Is the residue on the rinsed dishes bad?
I figured if the fresh water has antifreeze in it so does the gray & black tanks?
Yet out of my fear I only added about a quart to my fresh water tank.
I think it's about a 30-40 gallon tank?
I'll need to double check it's size & then maybe can figure out the right amount of antifreeze?