Bleach won't hurt the pipes.

It won't hurt the liner itself either, but we can't guarantee it won't bleach the liner color or print. Some liners are NOT chlorine resistant. It's a long story, but there is no way any of us have found for you to discover in advance whether you have a problem liner or not. I have some indication that most of Plastimayd's liners are properly resistant, but I don't know that for sure.

However, adding bleach -- which mixes instantly -- you are much less likely to have problems than with solid forms of chlorine.

Ben