Your toilet gurgles when the washing machine drains. The kitchen sink runs slow. A bad smell rises from the basement floor drain. This isn't a local clog — it's your main drain failing. And between the snake and the hydrojet, the tool you pick changes the result for years.
This guide separates the symptoms pointing to the main drain, explains why hydrojetting is the modern answer, and covers the edge case of century-old homes in Rosemont, Ahuntsic, and La Petite-Patrie where tree roots find their way into cast iron.
Main drain vs. branch drain — the difference that changes everything
Each fixture (sink, toilet, shower) has its own branch drain. These branch drains meet at the main drain, a 4- to 6-inch pipe that exits the house and connects to the municipal sewer. A clog in a branch affects one fixture. A clog in the main drain affects the whole house.
The 5 symptoms of a clogged main drain
If you check 2 or more, it's probably the main:
- Multiple drains slow at the same time — kitchen sink + shower + toilet all sluggish, not just one.
- Toilet gurgles when another fixture drains — trapped air pushes out through the toilet.
- Basement backup — water rising from the floor drain or basement toilet. Red alert.
- Persistent sewer odours despite cleaning — traps drying out as air can't push properly.
- Tub fills when washer drains — classic in homes with a basement laundry. The washer water looks for the easiest exit and comes up the tub.
Snake — the tool that makes a hole
An electric snake punches an opening through the clog. The rotating cable, fitted with a 2- to 6-inch cutting head, creates a passage. Water flows again. You feel relieved. But the grease, roots, and debris are still there, stuck to the pipe walls, ready to reform the clog within months.
The snake is perfect for a one-off obstruction — a diaper, a toy, a brush down the toilet. It's not enough for chronic grease buildup or tree roots.
Hydrojet — the tool that cleans
The hydrojet (water jetter) blasts high-pressure water (4,000–6,000 psi) through a nozzle that scours the pipe walls 360°. Instead of punching through, it scrubs. Grease, soap residue, sediment, and even roots are torn off and flushed to the municipal sewer.
Concrete advantages:
- Restores the pipe to its original capacity — we don't punch a hole, we fully clear the pipe.
- Results last 2 to 5 years instead of 3 to 6 months.
- Combined with a camera inspection, we see the result and document the drain's condition.
- Non-destructive — no digging.
Typical Montreal cost: $450 to $900 for a residential main drain, depending on access and length. Snaking alone is $200–$400 — but you'll pay again in 6 months.
Tree roots — the old-Montreal edge case
Homes built before 1970 in Rosemont, Ahuntsic, La Petite-Patrie, Hochelaga, and Villeray often have a main drain in cast iron or vitrified clay. Over 60 to 100 years, these materials crack at the joints. Water seeps out. Tree roots — silver maples, poplars, willows — find the moisture and creep in.
A 1 mm root through a crack becomes, in 3 years, a dense mat that catches every passing debris. The hydrojet cuts the roots. The camera inspection identifies the source. In severe cases, pipe lining or partial replacement is needed — but that's rare if maintenance is regular.
Prevention — what every Montreal owner should do yearly
- Preventive hydrojet every 2–3 years for homes over 40 years old.
- No grease down the sink — cooking waste goes in the trash, not the drain.
- Mesh strainers on every drain to catch hair and debris.
- A backwater valve if your basement is finished — mandatory in many Montreal boroughs.
When it's an emergency
If water is rising in the basement, if you can't flush, or if the sewer odour is strong: this is a 24/7 call. Tactical move while you wait: stop all water use (no toilet, no laundry, no dishes). Every litre you add ends up on your basement floor.
Summary — 30 seconds
- Multiple slow drains + gurgling toilet = main drain clogged
- Snake = quick fix, clog returns in 3–6 months
- Hydrojet = full clean, results last 2–5 years
- Cast iron + roots = old-Montreal signature, camera inspection needed
- Prevention = hydrojet every 2–3 years, strainers everywhere
Plomberie PSF unclogs main drains 24/7 in Montreal and Lanaudière. Full equipment on site — cable snake, high-pressure hydrojet, inspection camera — to diagnose and solve in one visit. Call (514) 655-6560 or request a quote at /contact. And if it's an emergency at 3am, we're already awake.