winter tank risks?

[Noah4448]

Originally Posted by Grey Goose

Couldn't you try calling a local "Porta-Potty" service and see if they could come pump your tank?

I have done this also and they will do it but go thru the toilet and I doubt they get it all so put antifreeze in tank to be sure.

[Trend_Owner]

Originally Posted by wyocamper

Wait, are you saying I shouldn't have used it in my radiator?


The point of pouring a full gallon in each tank is to lower the freeze point enough to keep the drain valves from being damaged until they can be drained. With somewhere around 7-10 gallons of waste in each holding tank, one gallon of AF in each will probably make a difference. And since propylene glycol is more dense than water it should eventually settle in the low point drain.

Remember that RV antifreeze does not lower the freeze point of the liquid in the holding tanks at all. It simply doesn't expand when it freezes.

Someone else suggested adding enough -40F windshield washer fluid to the holding tanks to sufficiently lower the freezing point, and that would work, but that fluid isn't cheap. Simply emptying the contents of the holding tank into a bucket and dumping that into a toilet is messy but cheap and effective.

[billtsunova]

Besides checking with your local waste treatment department, you also could check with local companies that service septic systems. They service customers year round!