Terryallan wrote:
bacabunch wrote:
The cleaning system, hook a hose to the outside hookup and it sprays out the black tank. The water left is in the bottom of the black tank not the bowl. Does the water ever completely drain from the black tank? Im sure im over thinking this but im sure rv antifreeze will just mix with any water residue.....
Honestly. NEVER leave the black tank completely empty, always leave a couple gallons of water in it to keep it from drying out, and causing a septic smell. I leave about 4 gal in mine with tankchem in there.
and there is no need to put antifreeze in there. Freeze damage only occurs when there is no room for the water to expand, once it starts to freeze. If you have 5 gal in a 30 gal tank. There is plenty of room for expansion.
If you have 5 gallons then your outlet pipe is likely full and when that freezes there's nowhere for it to expand to. I'd put antifreeze in, a few dollars to avoid having a burst pipe seems like cheap insurance. I say that as someone who blows out their lines because I use my trailer for extended trips well after winterizing up north and the one time I used pink stuff on there supply side my whole family hated the residual flavor even after 60 gallons was flushed through the system.
