Pink Stuff in Tanks

[masterdrago]

We are going to have an extended (36 hours) of below freezing temperatures. As low as the teens. It just dawned on this thick brained noob that I can put the pink stuff (rv antifreeze) in my holding tanks. It's 27 now and sleeting so I drained the last vestiges of fluids from my holding tanks. Black tank only had liquids from a few stops on the way back home and one of the holding tanks was 2 LEDs full. Drained them and closed valves and poured at least a half gallon of the pink crap (-50) into all of them. I had already blew out all the water lines and drained the pump and fresh water weeks ago. I just figured this out - pink in tanks - Duh!!

[mlh]

Why. You don’t need to. A little water in your tanks will not hurt them. Put an inch or two of water in a glass and put it in the freezer and see what happens, nothing except the water will freeze. It has a place to expand just like my outdoor faucets. They are frozen now. The water has a place to expand, back through the pipe.
Lynwood

[TLightning]

I don't put pink in the tanks....they'll be fine. I do put a 60w bulb by the water pump, don't want it to freeze.

[dieselguy]

Like the second and third replies ... I just drain the tanks. About the only place I use the pink stuff is in all PTraps and just a bit thru the pump. I use air for the rest.