Kinda curious how you changed the valves, if you're halfway into the second jug.. I was very quick on the trigger this time and filled all my lines with 1 gallon... 

My first thought is you didn't shut off the hot water tank value and took that much to fill it before pressure built up. 

 

I used to do that in my other trailers over the years. I found it to be a PITA compared to using anti-freeze. I can do the anti-freeze now with just a gallon and in less than a half hour (setup & clean-up). 

To each their own. 

Just watch your low points and be sure they're low points. That's what got me years back. FR has no control over the the rat's nest they install. Just no adult supervision... 

I'm a fan of anti-freeze, but that's me and my past experiences. I'm in the Nor'east and anti-freeze works for me. Two years of air and I had an issue.. Just got to cold and held some.. 

Again... Each to their own.

Yikes Jato! At 85 psi I'm surprised you haven't blown out your water lines from their connectors! Just a suggestion but you might consider dialing back your compressor to 35 to 40 psi. At that pressure it will do the job I assure you.

As you have experienced I have also with only using maybe a 1/3 of gallon, if that much, of RV anti-freeze a year. I also believe anyone who thinks air doesn't work in the "Great White North" just needs to read your post and see where you live. Though if any one here want's to spend a lot of money on RV antifreeze and time pumping it in your lines or don't own an air compressor go ahead and use over a gallon plus of RV antifreeze every year and enjoy all the time you spend flushing it out in the spring. As the saying goes "to each their own" what works for you might not for me and vice a versa. I can't wait to spring and bring my Pod out of its winter slumber where all I have to do is re-install the anode rod in the hot water heater and fill it with water and hit the road with it to another adventure.

Originally posted by jato What I neglected to mentioned when using 85 psi is the fact that 1 line is always open using this method. Before hooking up the air, one line is opened, lines are then pressurized, 2nd line is then opened. When clear of water I close first line and then open 3rd line and so on.

Jato, I do the exact same procedure as you do. Open one valve before chucking my air hose and opening another before closing the previous. My only concern for you is at 85 psi if you some how forget to always have a valve open you can and most likely will blow out a line, yikes! At 35 to 40 psi you will get the same results and you don't have to worry about blowing out a line if you goof, like I do often, and don't open a valve before you close one. Just my 2 cents for what its worth.