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When mechanical methods fail, many people use chemical drain cleaners to unblock a clogged or slowly flowing drain. While these products are useful in both opening drains and removing buildup, they can be harmful if misused and can cause potential property damage. Knowing the proper way to use a drain cleaner is important.

How to Use Drain Cleaner

  1. Grasp the handle of the bottle, then push down on the cap and twist to open.
  2. Pour approximately 16 fluid ounces (470 mL) down the drain (or follow package instructions).
  3. Wait up to 30 minutes for the clog to clear.
  4. Flush the drain with plenty of hot water.
Part 1
Part 1 of 2:

Buying a Drain Cleaner

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  1. Chemical drain cleaners or openers usually rely on a strong acid or alkali to do the job. These substances both break down and dissolve the clog, and react with the water to form heat.
    • Drain cleaners work best on slow moving drains. They are less effective in clogs with standing water.
  2. Drain cleaners are not safe for use in toilets, tubs, garbage disposals, or in fixtures with a macerator or grinder pump.
    • Drain cleaners are not recommended in houses with a septic system, as they can kill the bacteria inside the tank that help break down waste.
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  3. Most drain cleaners are either a concentrated "gel" or granulated crystals. There are also special types of drain cleaner for special jobs.
    • Some products use a two part formula to generate a kind of "foaming" action. These are good for removing buildup, but should not be used in a completely blocked drain.
    • Enzyme formulas exist, which attack the protein and fat bonds of clogs. These are safer and can be used on toilets and tubs, but are slower and less effective.
    • Heavy-duty formulas usually contain 100% pure lye or sulfuric acid. These are effective but can be highly dangerous to the untrained.
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Part 2
Part 2 of 2:

Using a Drain Cleaner

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  1. Drain cleaners are caustic and can cause harm to skin, eyes, and mucous membranes. When using a drain cleaner, wear safety goggles, rubber gloves that extend beyond the wrist, and a face mask or respirator if applicable.
    • Open the bottle while grasping the handle. Do not splash or squeeze.
    • Pour the specified amount into the drain.
    • Allow up to 30 minutes for the clog to clear.
    • Flush with plenty of hot water.
    • Remove any standing water.
    • Add 1-3 tablespoons of product into drain.
    • Add one cup of cold water.
    • Allow up to 30 minutes for clog to clear.
    • Flush with cold water.
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About This Article

David Balkan
Co-authored by:
Professional Plumber
This article was co-authored by David Balkan. David Balkan is a Professional Plumber, CEO of Balkan Sewer and Water Main Service, and President of Balkan Sewer and Drain Cleaning. As a hands-on owner of these companies for over 40 years, David is knowledgeable about water service lines, sewers, and drain line issues. David is a Committee Chairman of the Master Plumbers Council and has sat on the Executive Committee of the Sub Surface Plumbers Association of New York for over 30 years. His knowledge and solution-oriented approach contributed to Balkan Sewer and Water Main Service being the largest and most trusted service in New York City and the recipient of the 2017 Angie’s List Super Service Award. This article has been viewed 156,569 times.
1 votes - 100%
Co-authors: 6
Updated: November 7, 2024
Views: 156,569
Categories: Drains
Thanks to all authors for creating a page that has been read 156,569 times.

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