A while back I asked a question in a thread (The top A/C drain in my attic is leaking. Why?), and I wanted to know how to apply drain cleaner to the bottom drain on my A/C system. Could someone answer my question?

  • Do you have a picture of the drain assembly? Sometimes the installer will add a capped of vertical section just to clean out the drain or add cleaner. If not, you will have to add that yourself.
    – JPhi1618
    Jul 22, 2019 at 19:13
  • You should be using a coil cleaner, some drain cleaners will etch the aluminum fins and sealed lines possibly causing failure of the coil.
    – Ed Beal
    Jul 25, 2019 at 15:26


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