Problem · Drains

Slow drain — causes, fixes, and when to call a plumber

Most slow drains are local clogs in the trap or stub — cleared in 10 minutes with the right tool. Some are mainline issues that need a professional.

5 min readBy Kanata Plumbers Editorial
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Quick takeaways

  • Single slow drain: usually a local clog. DIY-able.
  • Multiple slow drains at once: likely a mainline issue. Call a plumber.
  • Gurgling or bubbling: venting or mainline issue. Call a plumber.
  • Skip the chemical drain cleaner. It damages pipes, doesn't reliably work, and is dangerous if a plumber later has to handle it.

Single fixture slow drain

For bathroom sinks and tubs, the clog is almost always hair and soap scum in the trap or just past it. A drain snake (Zip-It tool, $5) clears most of these in 5 minutes. For kitchen sinks, the buildup is grease — flushing with very hot water and a teaspoon of dish detergent often works.

Plunging works on most fixtures but needs the right plunger (cup style for sinks, flange style for toilets) and you need to block any overflow with a wet rag for it to generate pressure.

Multiple fixtures slow at once

When the toilet bubbles every time the washing machine drains, or the basement tub backs up when the upstairs shower runs, you have a mainline drain issue — not a local clog. Call us; this needs an auger or camera, not a plunger.

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