I have been using bleach to flush my a/c units condensate drain line for sometime - eliminate potential algae/mold build-up.
Today had unit PM'd and serviceman cautioned against using bleach. Claims they have had cases of damage to the PVC drain line due to the bleach. Recommended using vinegar instead. I have heard of vinegar controlling mineral build-up but not controlling algae.
He did blow out the line with nitrogen.
Any comments or experiences would be appreciated.