What can I do to stop Central Air Conditioner drainage from clogging up on an old house?

About three times a year the AC drain pipe clogs up and begins to leak by the filter. I have to run a garden hose and attach it to the pipes to clean it through. I know three times a year is way too many times. Is there any way to clean the pipe, such as chemicals that actually work?

What can I do to stop Central Air Conditioner drainage from clogging up on an old house?
Every weekend, while doing the laundry, pour a couple of caps full of bleach down the line. I added a little PVC extension to mine, with a cap.


A little goes a long way, if used regularly.
Reply:Are you attaching the hose to the pipe from the outside to free it up? If you are then you are just pushing the junk up in to the drain pan under the evaporator where it plugs up again.





You should be able to get the evaporator and pan clean enough to keep the pipe clean for a while. but I know accessing it on some installations can be real difficult. Can't help with that.
Reply:It's funny that u have to flush the line 3x a year. U must use the AC alot, otherwise, normal service is 1-every 3 years. They have a flex line brush that u can push it down the drain and clean the drain line that way and u can only buy it at aHVAC outlet. ( AC specialty store) where the service Tech. go to buy there parts.
Reply:go to an a/c dealer ask for antimold tablets, or get some at a pool dealer, [there bleach tablets ] like you use in a pool


small kind or use the big ones. only use 1 if big


put 4 or 5 in the drain pan by the drain opening,



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