Munn's told me to use water only, bleach causes the glue on the connections to soften and dissolve
And what accumulates is mostly grass clippings

I’m an HVAC Tech moving to the villages. Just take your shop vac to the outside end of and let it suck any debri out of the line and you’ll be fine.
Bill

Just had orientation today. It’s the condensation tube which leads to a p trap you pour 1 gallon of water to flush out the p trap every three months I believe. There is a back up kill switch that will shut down your ac if you don’t flush and get a back up

The PVC glue and pipes on the AC drain line are the same as for the hot water piping in a house. It is not really a glue since it melts the plastic of the pipes together. PVC pipe it designed for up to 140 degree water so it is safe to use any hot water that comes out of the faucet. I have a chlorine injector in my house and the PVC pipes have been fine for 10 years using up to 20 PPM chlorine at the injector, putting a small amount of bleach in a gallon of water will not hurt the pipes.

Why not, it a drain?

I collect it During dry spells and water my Pepper plants with it.

Only on newer built houses.

I do mine with garden hose pressure 55 psi. Takes about 4 mins.

Believe me do it!
 

We have a new house and I never pored water down the AC tube. Well to make a long story short > one day (house about 4-5 yrs old at this point) it backed up and we had water in our laundry room/hallway and kitchen from the AC water backing up. It was an expensive lesson. Bottom Line is its easy to do > do it.

Our AC company does this as part of their normal preventive maintenance program, and they have a drain line guarantee if you pay for their annual service. As far as I am concerned your AC service technician should be doing this. You shouldn't have to do it if you are having them do the maintenance.

Maintenance | M&S Air Conditioning

Putting water in AC tube
 

Yes. I've been told that here and elsewhere where I've had a heat pump. My understanding is that tube is to let the condensation out of the unit. I've been told to add bleach to the water and warm water shouldn't heart. It's to keep the tube clear of mold

It worked!
 

Thanks for all the condensate pipe cleaning suggestions, and especially to emtacba@aol.com for responding to my emails and including pictures of the pipe. Sure, it's easy enough to find the pipe once you know which one it is - hard if you're not sure and don't want to send vinegar directly into the a/c system itself. ; )

My husband and I moved here from Washington, DC, and in the 1920's rowhouse we lived in (plaster walls, cloth covered insulation on the wiring) there was no central a/c, only window units. We haven't done anything to the a/c in the 1.5 yrs we've lived here except change the filter every other month; didn't know maintenance was necessary. I first poured hot water into the pipe, and some not-pleasant-looking "stuff" came out into a bowl I placed to collect the water from the outside pipe. Then, I poured white vinegar into the pipe, and a tiny bit more stuff came out. Looks like that combo did the job! Left a bottle of vinegar next to the unit for next month's cleaning.

Thanks again for the tips! It's so true...Florida's friendliest hometown!
-Suzanne