RV Anti-Freeze Freezes

WyCamper wrote:
Just discovered that undiluted Supertech RV antifreeze, rated for -50F and sold at Wal-Mart, freezes solid at MINUS 2F!! I have 6 gallons of undiluted SuperTech in my 2010 5th wheel currently. Went out a few days ago to check that my toilet seal was holding antifreeze and found it frozen solid. Took pic with box of matches set on it. Bought another gallon at Walmart this week and set it out, unopened, two nights at below zero. Took another pic of it frozen solid this morning at Minus 2F. Getting the run-around from Wal-Mart, all they want to do is give me replacement product...they are missing the point. SUPERTECH should be pulled from the shelves and change their advertised rating of "-50F".

Funny...all these pages of responses and not one (that I saw) questions that he has used 6 gallons of A/F in his 5th wheel.

To the OP. You should try not to fill your water heater, or put a large amount of A/F in your tanks. My 38 foot trailer takes about 1 1/2 gallons. That includes the clothes washer and P-Traps. None in the water heater or fresh water tank. When (we snow bird) in warm weather, I run clean water thru the system for about 5 minutes, (with open faucets and open low point drains) to clear out any residual A/F. Run one empty load thru the clothes washer. Never get any after taste or odor.