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  • Writer's pictureGilad Ifrach

Bad smell coming from the floor drain

A bad smell coming from a floor drain can be unpleasant and indicate a few potential issues. Here are some common causes and solutions:

  1. Dry P-Trap:

  • Cause: The P-trap is designed to hold water, which prevents sewer gases from coming up through the drain. If the drain isn't used frequently, the water in the P-trap can evaporate, allowing odors to escape.

  • Solution: Pour water into the drain to fill the P-trap. Adding a small amount of mineral oil on top of the water can slow down evaporation.

  1. Biofilm or Organic Material:

  • Cause: Organic material like hair, soap scum, and grease can accumulate in the drain pipes, leading to bacterial growth and bad odors.

  • Solution: Clean the drain by pouring a mixture of hot water and vinegar or a commercial drain cleaner down the drain. For a more thorough clean, you can use a drain brush or snake.

  1. Sewer Line Issues:

  • Cause: Blockages or breaks in the sewer line can cause sewer gases to back up into your home.

  • Solution: If you suspect a sewer line issue, it's best to call a professional plumber to inspect and repair the line.

  1. Ventilation Problems:

  • Cause: The plumbing vent system, which allows air to enter the plumbing system and prevents a vacuum, could be blocked or damaged.

  • Solution: Check the roof vent for any obstructions like leaves, debris, or bird nests. If the vent is clear and the problem persists, contact a plumber.

  1. Mold and Mildew:

  • Cause: Damp conditions around the floor drain can encourage mold and mildew growth, leading to musty smells.

  • Solution: Clean the area around the drain with a mixture of water and bleach to kill mold and mildew. Ensure proper ventilation and reduce moisture levels to prevent recurrence.

  1. Incorrect Installation:

  • Cause: If the drain was installed improperly, it might not function correctly, allowing odors to escape.

  • Solution: Have a professional plumber inspect the installation to ensure it's done correctly.

Addressing these issues should help eliminate the bad smell coming from your floor drain. If the problem persists, it might be necessary to seek professional help for a thorough inspection and solution.

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