Disclaimer: This article is for informational purposes only. PlumberNearNearMe.com does not provide plumbing services and assumes no responsibility for any issues, damage, or costs resulting from actions taken based on this content. Always consult a licensed plumbing professional before attempting repairs, modifications, or diagnostic work.

Bathtub Drains Slowly Only Sometimes? Here's the Real Reason

Discover real reasons, practical fixes, and tips to prevent recurring slow drainage in your bathroom

A bathtub that drains slowly, but only occasionally, is one of the most confusing plumbing issues homeowners face. Sometimes it clears up on its own, sometimes it refuses to drain at all. I've seen this problem countless times, and most people end up calling a plumber unnecessarily.

Common Causes of Intermittent Slow Drains

Intermittent slow drainage is usually caused by issues that partially block water flow. Knowing the root cause helps you solve it without expensive repairs.

• 1Hair buildup trapped in the drain or strainer
• 2Soap scum creating sticky residue inside the pipe
• 3Partially clogged vent pipes
• 4Old or sagging pipes that trap water

Hair buildup is a common cause of intermittent slow drains

Fix #1 – Remove Hair and Debris

Even a small amount of hair or soap can slow drainage. Use a drain snake or hair removal tool regularly to prevent buildup.

Step by step

1. Remove the drain cover.
2. Use a flexible drain snake to remove hair and gunk.
3. Flush with hot water.
4. Repeat once a month.

Fix #2 – Check the Vent Pipes

If your tub drains slowly when other water is running, the vent pipe may be partially blocked. A blocked vent pipe prevents proper air flow and slows drainage.

• 1Look for gurgling sounds in other drains.
• 2Check roof vent for debris or bird nests.
• 3Call a professional if you cannot safely inspect the vent.

Fix #3 – Inspect Pipes for Sagging or Damage

Older homes sometimes have pipes that sag, creating dips that trap water and debris. This causes slow drains, but only intermittently.

What to do

• 1Visually inspect accessible pipes under the floor or behind walls.
• 2Look for sagging or cracked joints.
• 3Call a plumber to replace damaged sections.

When DIY Isn't Enough

If slow drainage persists despite cleaning and checking vents, it could indicate a more serious hidden clog or pipe problem.

• 1Drain remains slow after cleaning
• 2Multiple drains affected at the same time
• 3Unpleasant odor returns quickly

Final Advice

Intermittent slow drainage is usually simple to fix if caught early. Regular maintenance, vigilance, and understanding your plumbing system can save you both money and stress.

→ Next Article

• Water Pooling Around Toilet Base? Don't Ignore This Sign