re: Why’s to clean out AC drain line safely

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But why? I ask again, why the hell would they do that and how does that even work? Where does that water go out the roof?

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Convenience - and as others said a plumbing vent stack is part of the house drainage system - you have to vent drain pipes in order for them to drain properly.

It’s not against code in Louisiana, though it is in many other states. But there are code restrictions - it cannot be plumbed into a sanitary drain pipe connection (e.g., toilet) but it may be plumbed into a lavatory or utility sink drain vent stack. And the HVAC condensate drain must have a p-trap to prevent the potential for any drain sewer gases from backing up into the house air supply - just as you have a trap on all lavatory, kitchen, toilet, etc drain lines in the house.

I pour super concentrated vinegar down mine like twice a year. My neighbor likes to plug the outside drain and do this to let it soak for 20 minutes then unplugs it, but I find that unnecessary.

Bonus for this stuff - does a great job cleaning out my washing machine by pouring a lot in the detergent/softener slots and running a cycle with Affresh. Also when I have some mildewey clothes or towels I pour it in the fabric softener slot.

It is POTENT.





ETA:

Reading this thread, I never follow up with water

Yes, a plumbing system has to have vents to work properly regardless of a septic or sewer.

(no message)

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Ok was told to use wet vac outside then was told just poor bleach down drain line in attic. What’s best way or is there a better way?

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If your drain line is running to the outside of your house, I think that is your overflow pan line. I think the primary condensate line typically runs into your sewer line somewhere.

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Yes, a plumbing system has to have vents to work properly regardless of a septic or sewer.

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I was wondering more about the constant flow of water into a septic tank. When I lived in Georgia, I was on a septic tank. I installed a big ice maker in my garage and wanted to just plumb the drain into my existing drain but if I remember well, you were not allowed and not advised to have it drained in to the septic tank.

I just had it ran out the side of the garage into the flower bed. Mad a damn mess too just like my drain from the AC always does.

Drain gun