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I had a clogged drain pipe (coil to pan, not pan to outside) due to a bit of algae. It looks pretty clean now, but I'd like to clean the drain tract on the coil to knock down the trace amounts of it so it doesn't grow. Home depot said they only have the pills for the pan and nothing I could...

I have a 3.5 ton unit in a 1500 sq ft under air home. Insulation is not the best (R13 ish with almost 20% of the home being under a 'flat' roof), and it's located in S. Florida. It's a bit oversized still I believe. What appears to have happened was this unit was upgraded with a new...