: If the drain repeatedly clogs, it may indicate a collapsed pipe that needs a CCTV survey .

If boiling water doesn't work, try a chemical reaction to break up sludge.

Some clogs are beyond DIY. Call a licensed plumber if:

: For outdoor gullies, wear protective gear and manually remove visible debris like leaves or muck. When to Call a Professional

The good news? You can solve some sewer clogs yourself. The bad news? If you do it wrong, you could turn a $200 fix into a $5,000 disaster.

Before you begin, confirm the problem is in the main sewer line:

Unblocking a sewer drain requires immediate action to prevent property damage and health risks.

This is the easiest and cheapest solution, best for clogs caused by grease, soap, or fat buildup.