Nu-Calgon - Freez-Kontr'l is a formulation of propylene glycol, dipotassium phosphate corrosion inhibitor and de-ionized water. The fluid is colored blue to aid in leak detection. It has an operating temperature range from below -60°F to 230°F and solutions in water provide freeze protection to below -60°F and burst protection to below -100°F. Freez-Kontr'l - provides greater than -10ºF freeze protection and greater than -100ºF burst protection.
Freez-Kontr'l is nearly odorless and the product of choice when contact with potable water is possible. The ingredients used in its manufacture are GRAS (generally regarded as safe), under Title 21, Part 182 of the US Code of Federal Regulations, where accidental or incidental contact with potable water could occur.