Two Kinds of Liquids to Fix a Clogged Drain

Image of a drain by Sissel Karlsen

Image of a drain by Sissel Karlsen

Learn the science behind the two most common chemical drain cleaners.

When you need to fix a clogged drain, you should always prepare yourself mentally for the awful possibility that the drain will need to be disassembled and replaced entirely. That’s the worst case scenario, guaranteed to restore any drain system to service. The middle-of-the road solution is to snake the drain. This is difficult and uncertain work. But thanks to modern science, we also have a very easy solution that may be worth trying first of all. There are two types of liquids that you can use to clear a drain with as little as five minutes of work and a couple hours’ patience.


Lye, known to scientists as “sodium hydroxide,” is an extremely caustic base. Remember high school chemistry? Bases are the opposite of acids, but just as powerful at dissolving things like hair, grease, and bits of food.

Commercial formulations of lye include extra stuff to make it work faster and more safely. For instance, Drano contains a mixture of lye, aluminum flecks, and sodium nitrate. Some of the lye reacts with the aluminum and gets hot, which increases the effect of the rest of the lye on the grease in the drain. When the lye dissolves the grease, it releases explosive hydrogen. This could detonate your drains, except the hydrogen gets safely absorbed by the sodium nitrate.

The pros of lye are that it’s effective against sticky clog-smears like what you find in kitchen sinks, as well as thick hair clogs in bathrooms. The solution is denser than water, so you can pour it right into standing water and it will sink.

Note that to use lye effectively, you need to raise any stoppers that might be in place (duh, but no really, check this, especially in tubs) and pour in enough of it to fill and bypass the P-trap. The parts that clog are often the P-trap or the slow-running horizontal just past it.

There are three cons to using lye.

First, lye is extremely dangerous. Use latex or rubber nitrile gloves and chemical goggles, or else be extremely careful about drips and splashing. Do not use lye while eating, smoking, or with a runny nose unless you take off your gloves and wash your hands before you touch your face. Never leave it within reach of children or pets.

Second, lye can get so hot that it boils the drain water. This may create aggressive bubbling or splashing in the sink or tub. If you have a spare bucket, turn it upside-down over the drain after you lye it. If there is a lot of standing water, the water may act as enough of a damper, or you may wish to start slow and pour only as much lye as needed. If you lye a garbage disposal, do not run the disposal until the water has settled.

Third, lye dissolves toilet wax rings. You cannot use lye in a toilet without creating a leak. You may not see it, but it will be there. Toilets must be plunged or snaked, or the lye inserted into the sink and allowed to work its way down below the way ring. (But most likely, this isn’t where the clog is. Toilets don’t need lye because the drain is so wide.)


The second kind of liquid assistance is called “build-up remover,” and it’s actually less of a “chemical” and more of a “biological.” Buildup removers are solutions of bacteria or biological enzymes that eat or dissolve the crud stuck to your pipes. They then get washed downstream. Bacterial cleaners are mixed with propylene glycol, which is the same liquid used to de-ice planes, and it’s the same as the “juice” people vape.

Compared to solutions of lye, bacterial drain cleaners are safer. They require less eye and skin protection. But you still should be careful not to ingest or splash the product.

Buildup removers are better used as a preventative on a regular basis than as a clog-fixer. They can dislodge wall coatings and create clogs. If this happens, pour hot water down the drain and it should loosen. You may need to alternate bacteria with lye to clear a neglected drain.

In conclusion, tough clogs need a combination of chemicals centered around lye as the main ingredient. Slow running and constricted drains can be moved along with periodic bacterial rinses. Always wear safety equipment, follow instructions on the label, and be patient. Good luck!

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Members can search our service provider director for drain cleaning (a separate skill from plumbing) to get your building back in service.


13 Responses to Two Kinds of Liquids to Fix a Clogged Drain

  1. Jordan Lefroy says:

    I’m very pleased to find this great site. I wanted to thank you for ones time for this particularly wonderful read!! I definitely appreciated every part of it and I have you bookmarked to look at new stuff on your web site.

  2. Zac Styles says:

    This is a really good read for me. Must admit that you are one of the best bloggers I have ever read. Thanks for posting this informative article.

  3. plumbing installation love says:

    Thanks for this blog. I learned some tips about this blog. I had experienced these problems last week thanks to my friend who help me with my problem. I hope you post more blog helps us. So that we can learn more. Thanks for the ideas you shared with us. It is a big help not just for me but for all the readers who don’t have any ideas about this kind of tips.

  4. panji says:

    It s good to know there are still a few good man out there who are willing to share good things with others. This website is good enough, complete with its cons and safety precautions, well presented and simple to understand, makes me recall Mac Gyver in the past. keep up the good work dude. I hope that the more you give, the more you ll gain.. thank you

  5. Alex says:

    Tried putting some hair overnight in concentrated lye solution. Nothing happen. Hair still there… sure it dissolved hair?

  6. plumbing installation sure says:

    Thanks for this blog you post. It is very helpful to me I hope you post more help from us. So that we can learn more about how to manage this kind of plumbing plan. Choosing the best for your home is the best you must do.

  7. Nick Knack says:

    Your post gives some very useful tips on kitchen sink unclogging. Some things are best not to dispose in the drain like tea bags, egg shells, pastas or rice etc. Also, try not to dispose too many food materials into the drain. I’ve learned my part of doing these and the only solution was a emergency drain cleaning service.

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