FYI, I sent a message to the "Ask the Expert" section on the Munn's website about how to maintain the condensate drain line. This morning, they called me back and said that they no longer recommend using any chemicals to flush the drain. Their current recommendation is to add a gallon of warm water to the drain at least 4 times per year. This recommendation is endorsed by Carrier, which is a very common brand HVAC system in The Villages. In the past, Munn's recommended using vinegar, hydrogen peroxide, or dish soap, but they no longer recommend these chemicals.
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