Winter Question for Black and Grey Tanks

[APapaCharlie]

Hey All,

The better half and I live in our Jayco full time in Washington State and winter is almost here. Last year our black tanks froze so this winter I was wanting to not have to deal with that again which leads me to my inquiry. Is it ok to use antifreeze in the tanks and everytime we have to empty just add more antifreeze to the tanks? I'm open to anything not expensive so I was thinking this was the cheapest route to take but any ideas are greatly appreciated. Thanks!

 

[Grumpy]

Antifreeze will just get diluted by the water you add when flushing. Why not use heat tapes on valves and the pipes leading from the tanks and heat pads on the tanks.