Gardening Methods

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?

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.

The Gardening Clogs Part 2