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ComStar's Geothermal-PG (Propylene Glycol) RTU (Ready-To-Use) Heat Transfer Fluid (HTF) is a unique blend that provides freeze protection, corrosion resistance and particle suspension in geothermal systems and earth loops. Odorless, non-hazardous and biodegradable, ComStar's Geothermal-PG prolongs the life of your system with its special corrosion inhibitors to protect metal and aluminum components from corrosion, scale and freezing. Its low toxicity makes it the only geothermal and earth loop antifreeze that is allowed in many states.