I had a gallon left over, which I put in my storage building to use next year. When I was in my storage building, I noticed that the jug was frozen. What you experienced is perfectly normal for RV Antifreeze. When exposed to extremely low temperatures, RV antifreeze does appear to freeze. As you know, damage to the plumbing system is caused by expansion of water in freezing conditions.
Freeze point is the temperature at which the first crystals of ice form in the antifreeze solution.
Burst point represents the lowest temperature at which the solution protects the system from damage caused by solution expansion. Follow package directions, using one tablet per 15 gallons of tank capacity. We suggest that your RV be in motion during the cleaning process. It is recommended that you clean your fresh water tank at least three times a year. To keep your water tank at a city water pH level, add Camco's Drinking Water Freshener every time you add water to your tank.