I guess this is why Carrier says do not pour Vinegar down your condensate drain.
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Corrosion is one of the leading causes of AC cooling coil leaks. The coil’s material, usually copper or aluminum, can react with chemicals in the air. These reactions, especially involving formic acid or acetic acid, eat away at the metal, creating small pinholes over time. Common sources of these chemicals include household cleaning agents, adhesives, and paints.
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