Slow Draining Sink? The Calgary Homeowner’s Guide to Clearing Clogs
You’re in the bathroom and finish brushing your teeth, but the water just… sits there. Few household annoyances can test your patience like a slow draining sink.
But before you reach for that bottle of chemical drain cleaner under the cabinet, there’s something Calgary homeowners need to understand: in our city, slow drains aren’t just due to hair, soap, and grease build-up.
Our local water quality plays a significant role in your plumbing health, and ignoring that reality can turn a minor annoyance into a costly repair.
The good news? Many slow drains can be fixed in 15 minutes or less with supplies you already have at home!
In this guide, we’ll walk you through quick DIY fixes, help you understand what’s actually causing the problem, and show you how to recognize when it’s time to call a professional for drain cleaning in Calgary.
- Why Is My Sink Draining Slow?
- DIY Fixes: Try These Before Calling Us
- What to Avoid
- When to Call a Professional Plumber
- Prevention: Keeping Your Drains Clear
- When a Slow Drain Becomes an Emergency
Why Is My Sink Draining Slow?

Understanding what’s causing your slow drain is half the battle. Here are the most common culprits Calgary homeowners encounter.
The Usual Suspects
Hair and soap scum are the primary offenders in bathroom sinks. Hair catches on the drain stopper or inside the pipe, then soap residue binds it together into a stubborn “gunk ball” that grows larger over time.
Food waste and grease cause most kitchen sink slowdowns. This is especially problematic in Alberta, where grease cools and hardens much faster during our cold winters. Sometimes, it solidifies before it even leaves your property.
Toothpaste and shaving cream might seem harmless, but they create a cement-like paste inside your pipes over time. Combined with hair and hard water minerals, this residue narrows your drain opening significantly.
The Calgary Factor: Hard Water Scale
Here’s where living in Calgary makes a real difference.
According to the City of Calgary, our tap water is classified as “hard” to “very hard,” with mineral content typically ranging between 120 to over 200 mg/L of calcium and magnesium. That’s well above what most plumbing systems are designed to handle long-term.
Over time, mineral scale builds up inside your pipes, gradually narrowing the diameter. So, that two-inch pipe can effectively become a one-inch pipe, meaning clogs form much faster and clear much harder.
This hard water buildup affects every drain in your home, not just the one that’s currently giving you trouble.
DIY Fixes: Try These Before Calling Us
Before scheduling a service call, these methods can solve most minor slow drains. Start with the first option before trying the next.
1. The Boiling Water Flush
Best for: Grease and soap scum buildup
Boil a full kettle of water and pour it directly down the drain in two or three stages, allowing the hot water to work for several seconds between pours. The heat melts grease and loosens soap residue.
Warning: Do not use boiling water if you have PVC pipes (common in newer Calgary builds) or a porcelain sink, as the extreme temperature can cause cracking. Use the hottest water from your tap instead.
2. The Baking Soda and Vinegar Method

Best for: Organic buildup and mild clogs
Pour 1/8 cup of baking soda down the drain, followed by 1/4 to 1/2 cup of white vinegar. Cover the drain immediately; you want that fizzing action working inside the pipe, not escaping into your sink.
Let it sit for 15 minutes, then flush thoroughly with hot tap water right away to prevent the baking soda from forming a paste in your pipes.
The fizzing reaction creates pressure that can help dislodge minor buildup, and both ingredients are environmentally friendly.
Warning: This method isn’t recommended for older plumbing systems; the pressure from the reaction can potentially cause cracks or damage to aging pipes.
3. Use a Drain Snake
Best for: Clogs just below the drain opening
A drain snake (or drain auger) is an inexpensive tool that pulls hair and debris out of the drain. Insert it slowly, rotate gently, and pull it back out.
This works anywhere where hair buildup is the most common cause of slow drainage: bathroom sinks, showers, and bathtubs.
Warning: Kitchen sinks, garbage disposals, and narrow drain openings may block drain snake access, and forcing it can damage the drain opening or push the clog deeper. If it doesnāt fit or doesnāt improve drainage after a few tries, try the next step.
4. The Plunger Technique

Best for: Stubborn clogs that won’t budge
Plungers aren’t just for toilets, but use a sink plunger (the flat-bottomed cup style) instead of your toilet plunger.
Fill your sink with about two inches of water to create a seal around the plunger cup. Position the plunger over the drain and pulse gently but firmly. The pressure change often dislodges clogs that other methods can’t reach.
For double kitchen sinks, plug the second drain with a wet cloth to maintain pressure.
5. Cleaning the P-Trap
Best for: Locating and removing the actual clog
The P-trap is the U-shaped bend in the pipe under your sink, and it’s where many sink clogs live. Place a bucket underneath to catch water, then unscrew the slip nuts on either end. Remove the trap, clear out any debris, and reassemble.
This is messier than other methods, but it’s also the most effective for persistent clogs. You’ll often find the exact item causing your problem, whether that’s a buildup of gunk, a lost earring, or a chunk of food waste.
Warning: In older homes, P-trap components may be rusted or brittle. Taking things apart can reveal worn parts that won’t reassemble properly or crack under pressure when you try to loosen them.
If your plumbing has some years on it, consider calling us first to avoid turning a simple clog into a bigger repair.
What to Avoid
Harsh Chemical Drain Cleaners
Chemical drain cleaners (Drano, Liquid-Plumr) might seem like an easy solution, but they can create more problems than they solve.
These caustic chemicals can corrode older metal pipes, which is a real concern in established Calgary neighbourhoods like Mount Royal, Inglewood, and Bridgeland, where original plumbing may be 50 years old or more.
Chemical drain cleaners also harm our local water treatment systems and can damage your septic system if you have one.
According to Statistics Canada, approximately 7.3% of Canadian households live in homes already needing major repairs, including defective plumbing. Harsh chemicals accelerate the need for these expensive repairs.
If you’ve already used chemical cleaners and they didn’t work, let your plumber know before they arrive. Some tools and techniques aren’t safe to use after chemical exposure.
When to Call a Professional Plumber
DIY methods work well for simple clogs, but some situations require professional equipment and expertise. Call a plumber if you notice any of these warning signs.
Multiple Slow Drains
If your toilet, sink, and shower are all draining slowly, the blockage is likely in your main sewer line. This is not something you can fix from inside the house.
Foul Smells
A rotten egg odour could indicate a venting issue or sewer gas backing up into your home. This isn’t just unpleasant; it’s a potential health hazard.
Recurring Clogs
If you clear a drain and it clogs again within a week or two, you may have tree root intrusion. This is common in mature Calgary neighbourhoods where large trees have had decades to send roots toward your sewer line.
A video pipe inspection can identify the exact location and severity of root damage.
Water Backing Up Elsewhere
If water appears in your bathtub when you run the kitchen sink, or your toilet bubbles when you use the washing machine, you likely have a mainline problem that needs immediate attention.
Prevention: Keeping Your Drains Clear
The best drain problem is one that never happens. These simple habits keep your pipes flowing freely year-round.
Use Mesh Drain Strainers
These inexpensive screens catch hair, food particles, and other debris before they enter your pipes. Use them in every sink and clean them weekly.
Never Pour Grease Down the Drain
Wipe pans with a paper towel before washing, and dispose of cooking oil in the garbage. This single habit prevents most kitchen drain clogs.
Flush Drains with Hot Water Weekly
Once a week, do a longer hot-water flush to clear any buildup thatās started to form.
Consider a Water Softener
Given Calgary’s exceptionally hard water, installing a water softener reduces mineral scale throughout your entire plumbing system, not just your drains. This extends the life of your pipes, water heater, and appliances.
Be Prepared for Winter Emergencies
Calgary’s freeze-thaw cycles put extra stress on plumbing. Keep drains clear heading into winter, and know how to handle frozen pipes when temperatures plummet.
When a Slow Drain Becomes an Emergency
Most slow drains are simple fixes, but persistent ones signal a deeper problem in your home’s plumbing system. Left unaddressed, a minor slowdown can lead to complete blockages, water damage, or even sewage backup.
Tried the vinegar trick and still standing in water? Don’t let a slow drain become a burst pipe. Request a Quote from Son-Rise Plumbing today and get your sink flowing freely again.









