7 Items You Should Never Put Down the Drain

Most Drain Clogs Are Preventable

The majority of drain clogs HYDROPRO clears every week in Vancouver and Burnaby are entirely preventable. They weren't caused by faulty pipes or ageing infrastructure — they were caused by everyday household items that went down the drain when they shouldn't have. Prevention is far cheaper than a service call, and it starts with knowing what your drains are not designed to handle.

Here are the 7 most common offenders that damage your drains and what to do with them instead.

1. Cooking Grease and Oil

Cooking grease is the leading cause of kitchen drain clogs in Metro Vancouver, and it's easy to understand why — grease flows easily when it's hot and liquid. The problem is what happens inside your pipes once it cools. Grease solidifies on the interior walls of your drain line, building up layer by layer with every pour until the pipe is partially or completely blocked.

Even grease washed away with hot, soapy water simply travels further down the line before cooling and solidifying. Over time, fats from cooking combine with other debris to form thick, hard deposits that are difficult to remove without professional hydro jetting.

Proper disposal: Pour cooled cooking grease and oil into a sealed container — an old jar or takeout container works well — and dispose of it in your regular garbage. The City of Vancouver also accepts cooking oil at recycling depots.

2. Coffee Grounds

Coffee grounds are one of the most deceptive drain hazards in the kitchen. They seem fine going down — they're small, they're wet, and they appear to wash away easily. But coffee grounds don't dissolve in water. They accumulate inside drain lines, mixing with grease and other residue to form a dense, sludge-like blockage that can be surprisingly difficult to clear.

Even if you have a garburator (garbage disposal), coffee grounds should not go down it. Most residential garburators are not designed to handle large volumes of coffee grounds, and the grounds can accumulate around the drain opening and in the trap below the disposal unit.

Proper disposal: Add coffee grounds to your compost bin, where they make an excellent soil amendment. Vancouver's green bin program accepts coffee grounds.

3. Eggshells

The belief that eggshells are harmless — or even beneficial — in a garburator is a persistent myth. Eggshells break down into tiny, sharp granules that stick to the interior of pipes and other materials already in the line, forming a sticky, abrasive mass. The thin membrane attached to the inside of eggshells is particularly problematic, as it can wrap around garburator shredder rings and cause mechanical issues.

Proper disposal: Eggshells are ideal for composting. Crushed eggshells also have value in the garden as a slow-release calcium supplement for soil.

4. Flour, Starch, and Sticky Foods

Flour, rice, pasta, oatmeal, and similar starchy foods expand and become sticky when they contact water. When they enter your drain, they form a thick, paste-like substance that clings to pipe walls and catches every other piece of debris that passes through. A small amount of flour rinsed down the sink might seem harmless, but the accumulation over months and years creates a genuine blockage hazard.

This category also includes cooking starches like potato peeling water and leftover gravy, both of which are frequently poured down kitchen sinks. Even in diluted form, starches contribute to the buildup layer inside drain lines.

Proper disposal: Scrape plates and pots into the garbage or compost before rinsing. Use a sink strainer to catch any food particles before they enter the drain.

5. Hair

Hair is the primary cause of bathroom drain clogs. A single shower sends only a small number of strands down the drain, but those strands accumulate in the P-trap and drain line, combining with soap scum to form a dense mat that eventually blocks water flow almost completely.

This is as much a kitchen drain issue as a bathroom one — hair from shaving, washing pets in the tub, or even brushing hair near the sink all contribute. Long hair is especially problematic because longer strands tangle more readily and form larger masses faster.

Proper disposal: Install a hair strainer or drain cover in every shower and bathtub drain. Clean it after every shower. This single habit eliminates the most common cause of bathroom drain clogs.

6. "Flushable" Wipes

Despite the labelling, "flushable" wipes are not safe for your plumbing or your municipal sewer system. Unlike toilet paper, which is specifically engineered to dissolve rapidly in water, wipes — even those marketed as flushable — retain their structural integrity long after being flushed. They travel through household pipes, pass the initial plumbing, and accumulate in sewer mains where they combine with fats and oils to create massive blockages known as "fatbergs."

Metro Vancouver's wastewater utilities deal with wipe-related blockages on a regular basis. At the household level, a buildup of wipes in your sewer lateral can cause a complete sewage backup that requires professional sewer repair.

Proper disposal: Dispose of all wipes — regardless of packaging claims — in the garbage. The only thing that should ever be flushed is toilet paper.

7. Paint, Solvents, and Household Chemicals

Pouring leftover paint, paint thinner, cleaning solvents, or household chemicals down the drain is both a plumbing risk and an environmental violation. Harsh chemicals can corrode older metal pipes over time, damage the biological activity in septic systems, and contaminate Metro Vancouver's wastewater treatment process. Water-based latex paint is less immediately harmful but still not acceptable in large quantities.

Oil-based paints, mineral spirits, and other petroleum-based solvents are classified as hazardous household waste in British Columbia.

Proper disposal: Metro Vancouver operates several Household Hazardous Waste collection facilities that accept paint, solvents, and chemicals at no charge. Unwanted usable paint can be donated through the PaintCare recycling program available at many hardware stores across the Lower Mainland.

Kitchen vs. Bathroom Drains: Key Differences

Kitchen drains handle hot water, grease, food particles, and soap — and are most commonly blocked by accumulated grease and starch. Bathroom drains primarily handle hair, soap scum, and body care products, and clog most frequently from hair accumulation in the trap.

Both drain types benefit from monthly maintenance: a kettle of hot (not boiling) water poured slowly down kitchen drains helps soften grease buildup, while a hair strainer in the shower prevents the number one cause of bathroom clogs before it starts.

When prevention isn't enough, HYDROPRO's professional drain cleaning service restores full flow quickly. Call 604-652-4356 to book a drain cleaning across Vancouver, Burnaby, and Greater Vancouver.

Frequently Asked Questions

Can I pour boiling water down the drain to clear grease?

Boiling water can help loosen fresh grease before it solidifies, but it is not a reliable solution for clearing an established grease clog. Boiling water can also damage PVC drain pipes if used repeatedly, as the sustained heat softens the plastic over time. For a minor fresh grease incident, hot (not boiling) water followed by dish soap can help. For actual grease buildup, professional drain cleaning is the only fully effective remedy.

Are "flushable" wipes really safe for plumbing?

No. Despite their labelling, "flushable" wipes do not break down in water the way toilet paper does. They pass through your household pipes and accumulate in sewer lines, where they combine with fats and oils to form large blockages. Metro Vancouver's wastewater systems deal with wipe-related blockages regularly. The only item that should be flushed down a toilet is toilet paper. If you're already experiencing slow or backed-up drains, contact HYDROPRO at 604-652-4356 for professional drain cleaning.