There is nothing quite as frustrating as a sink that refuses to drain or a shower that leaves you standing in an inch of lukewarm water. For many Toronto homeowners, the go-to solution is a drain snake. Whether it’s a manual hand-crank version from the local hardware store or a rented power auger, the goal is the same: poke a hole through the blockage and get things moving again.
However, a variety of factors can lead to recurring clogs. While snaking a drain is a common quick fix, it doesn’t always address the root cause of the problem. You might enjoy a few days, or even weeks, of free-flowing water, only to find yourself right back where you started. To avoid the frustration of repeated backups and the very real risk of potential water damage, it is vital to understand why a simple clearing might not be enough and why comprehensive drain cleaning is often the only permanent solution.
At Priority Plumbing & Drains, we see this cycle constantly. If your pipes are acting like a boomerang, returning to a state of blockage shortly after you’ve cleared them, one of the following five underlying issues is likely to blame.
1. The “Soft Blockage” Factor
The most common reason a drain backs up shortly after snaking is the nature of the blockage itself. Plumbers often refer to these as “soft blockages,” which are typically a combination of cooking grease, fats, oils, hair, and soap scum.
When you run a mechanical snake through a pipe filled with grease, the metal coil is designed to hook onto solid objects (like a clump of hair or a child’s toy). However, grease has a consistency similar to toothpaste or heavy sludge. Instead of clearing the pipe, the snake simply pokes a small hole through the center of the mass.
The water will begin to flow through that tiny new channel, leading you to believe the job is done. But the walls of the pipe are still lined with thick, sticky residue. As soon as you wash more debris down the drain, it gets caught in the remaining sludge, and the small hole quickly seals back up. Without a professional scouring, such as hydro-jetting, the “soft blockage” remains ready to cause another backup.
2. Tree Root Intrusion
Toronto is famous for its beautiful, lush tree canopy, especially in older neighborhoods like The Annex, Riverdale, or High Park. While these trees add character to our streets, their root systems are constantly searching for moisture and nutrients. Your sewer line, which carries warm, nutrient-rich water, is an irresistible target.
Tree roots are incredibly persistent. If there is a tiny crack or a loose joint in an older clay or concrete pipe, a microscopic root fiber will find its way in. Once inside, it grows rapidly. When you snake a drain affected by roots, the blade may cut away some of the “hair” of the root mass, allowing water to pass temporarily.
However, the main root structure remains outside the pipe, and the snake’s “pruning” action actually stimulates faster regrowth. Within a few weeks, the roots have filled the pipe again, catching toilet paper and solids along the way, creating a stubborn backup.
3. Bellied or Collapsed Pipes
Sometimes the issue isn’t what is inside the pipe, but the pipe’s shape. Over time, the soil beneath your home can shift due to Toronto’s freeze-thaw cycles or simple erosion. When this happens, a section of the horizontal sewer line can sink, creating what plumbers call a “belly.”
Gravity is supposed to pull waste downward toward the city’s main. In a bellied pipe, a “low spot” forms where water can sit permanently. Debris like heavy toilet paper and organic waste settles in this pool rather than washing away. Snaking will clear the standing debris, but because the physical dip in the pipe remains, new debris will inevitably settle in the exact same spot.
In more severe cases, the pipe may have actually collapsed. If the pipe’s structural integrity is compromised, a snake might pass through the dirt and rubble temporarily, but the earth will quickly settle back into place, blocking the flow once more.
4. Pipe Scale and Tuberculation
If you live in one of Toronto’s many historic homes, your drainage system likely utilizes cast iron pipes. While durable, cast iron is prone to a process called tuberculation. Over decades, the inside of the metal pipe corrodes and develops “scale,” which refers to the jagged, rusty bumps that turn the once-smooth interior into something resembling a cave wall or a piece of heavy-grit sandpaper.
When you run a snake through a scaled pipe, you might clear a specific clog of hair or paper, but you aren’t fixing the pipe’s internal texture. These jagged “burrs” of rust act like Velcro, snagging every bit of lint, hair, and waste that passes by. Because the pipe’s diameter has been effectively narrowed by the scale, it takes very little debris to cause a secondary backup. Snaking is a temporary relief for a structural aging problem.
5. Hidden Main Line Issues
Many homeowners attempt to solve their problems with a small, hand-held snake purchased at a big-box store. These tools are often only 15 to 25 feet long. While they work great for a clog located right behind a sink trap, they cannot reach the main sewer line that runs deep under your basement floor and out to the street.
If the blockage is 40 or 50 feet from the drain opening, a standard snake won’t even reach it. You might feel like you’ve cleared the “local” clog because the water moves slightly, but the pressure from the main line backup will eventually push water back up into your lowest drains (usually the basement floor drain or shower). Without professional-grade equipment capable of reaching the full length of your lateral line, you are only treating the symptoms, not the disease.
The Priority Plumbing & Drains Difference
While a DIY snake is a valiant first effort, recurring backups are a signal that your plumbing system is asking for professional help. Continuing to snake a compromised pipe can actually lead to further damage, especially if the pipe is old and fragile.
Partnering with a licensed plumbing expert is essential for a permanent fix. At Priority Plumbing & Drains, we don’t believe in guesswork. We use advanced camera inspections to travel deep into your pipes. This allows us to see exactly what is happening, whether it’s a “belly” in the line, a thicket of tree roots, or a buildup of scale. Once we identify the true culprit, we provide long-term solutions, from high-pressure hydro-jetting to trenchless pipe repair.
Stop fighting the same clog week after week. If your drains are still backing up after snaking, it’s time to call a professional. Let our team provide a comprehensive drain assessment and long-term solutions to keep your home dry and your pipes flowing freely. Call us today to schedule your inspection!