Anti Freeze in Black Tank

[tuna_fisher]

If I was to put RV anti freeze in my black tank how would that work? My black tank is only 12 gal. how much would I need if it was to be near full without making it to weak. I'm sure it depends on how cold it was to get, so let's say 20. Thanks....

[jk31668]

i use the cheaper blue windshield washer fluid. good down to -20

[WyoTraveler]

Assume you are planning cold weather camping. When camping in my precious TT with enclosed tanks I would winterize helow 10 degrees. I used bottled water for drinking, cooking and washing. I flush my toilet using anti freeze. Actually I have found that the black tank actually stays warm because of composting and breaking down of solids. In the grey tank I added anti freeze as I added water and seemed to work out OK.

[2oldman]

tuna fisher wrote:
If I was to put RV anti freeze in my black tank how would that work? My black tank is only 12 gal. how much would I need if it was to be near full without making it to weak.

Probably 12 gallons. It's supposed to be used full strength. Car anti-freeze would be better.. but then you have to get rid of it.

If you have time you can always run your own test in your freezer at home.

[Tachdriver]

Does your tank already gave waste in it?

If not I only put about a 1/2 gal, you don't need to fill it