Clearing a blocked drain is easy. Making it stay clear is the real job. If the same sink, tub or floor drain backs up every few months, something underneath is causing it, and a plunger or a bottle of chemicals is not going to reach it.
The Usual Suspects, Fixture By Fixture
- Bathroom sink and tub: hair and soap scum, almost always within the first metre of pipe. A proper cable clears it; a hair catcher keeps it clear.
- Kitchen sink: grease that cooled and set, often years of it, narrowing the line until a small amount of food finishes the job. Hot water and detergent make it worse over time by moving the grease further down.
- Toilet: wipes (even the ones labelled flushable), or a partial blockage further down the main line that only shows up at the lowest fixture.
- Floor drain or basement fixture backing up: this is the main sewer line, and the cause is usually roots, a belly, or a broken section.
When It Is The Main Line
In Langley, Surrey, New Westminster and the older parts of most Lower Mainland cities, sewer laterals are often original clay or concrete pipe. Tree roots find the joints and grow into them looking for water. Cable the roots out and they grow back; the interval between blockages just gets shorter. The permanent fixes are a camera inspection to see exactly what is there, then either a spot repair at the failed joint, a liner, or replacement of the run.
A belly, where a section has sagged, holds water and waste in the low spot. No amount of cleaning fixes a belly; the section has to be re-laid to fall.
Why Chemical Drain Cleaners Make It Worse
They rarely reach a real blockage, they damage older metal pipe and rubber couplings, and they leave a caustic soup sitting in the line for whoever opens it next. If a drain needs more than a plunger, it needs a cable or a camera, not chemistry.
What A Proper Visit Looks Like
- Clear the blockage mechanically.
- If it is a repeat, put a camera down the line and locate the problem from above ground.
- Show you the footage and give you a written option: leave it, spot repair, or replace.
That is the difference between paying for the same drain call three times a year and paying once.
Related: camera inspections · drainage and excavation
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