Tenant caused clog causing drainage leak

[Peter Morgan]

Hello,

My tenant recently vacated the apartment and there were no drainline issues before he moved in and its a fairly new plumbing line a little over two years. He most likely abused the plumbing system letting hard waste going through the line and most probably used harsh chemicals such as drainex causing these issues. Can I withhold his deposit for wrecking my plumbing system? I will appreciate your inputs.

Thanks