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The Cryo-Tek Solar System Antifreeze is a blend of polypropylene glycol and high-purity additives formulated for use in closed-loop, radiant tube heating systems, geothermal loop and antifreeze heat exchanger systems. The Solar System Anti-Freeze can be used in solar heating systems that require freeze protection. The triple-protection formula stabilizes pH to prevent acid corrosion, chelates hard-water minerals, and inhibits the formation of scale and sediment. Compatible with PEX and elastomeric radiant tubing. Cryo-Tek is ‘GRAS’ (Generally Recognized As Safe) for incidental contact with food.