What type of antifreeze is recommended for use in potable water and sanitation systems for winterization?

The recommended type of antifreeze for use in potable water and sanitation systems for winterization is propylene glycol. This choice is particularly important because propylene glycol is considered safe for use in food and potable water systems, making it suitable for applications where it might contact drinking water.

Unlike other types of antifreeze, propylene glycol is non-toxic and has a low degree of toxicity, which is crucial when it comes to systems that provide water for human consumption. It effectively lowers the freezing point of water, preventing ice formation during cold temperatures, which can cause damage to pipes and systems.

Ethanol and isopropyl alcohol are not safe for use in potable water systems due to their toxicity and potential harmful effects if ingested. Ethylene glycol, another common antifreeze option, is highly toxic and poses significant health risks if ingested, making it unsuitable for use in any system that could come into contact with drinking water.

Thus, propylene glycol is the best and safest choice for ensuring that potable water and sanitation systems are adequately protected from freezing conditions without compromising safety.