Have you ever had to work on drain systems affected by corrosion or deterioration? If so, how did you address the issue?

Can you describe a time when you had to work on a drain system in an older building with outdated plumbing infrastructure?

How do you handle situations where you encounter hazardous materials or substances during drain repair work?

Are you familiar with using leak detection equipment to identify hidden drain leaks?

Can you explain the process of drain sanitization and its importance in maintaining hygienic conditions?

How do you handle situations where drains need to be repaired in occupied residential or commercial buildings?

Have you ever had to work on drain systems with unique or unconventional layouts? If so, how did you adapt your approach?

Can you describe a time when you successfully repaired a drain system without causing damage to surrounding structures?

How do you ensure that your work complies with local building codes and regulations?

Are you familiar with using chemical drain cleaners or other products? When do you consider them appropriate?