What Is The Black Slime In My Bathroom Sink?

A bathroom sink goes through a lot of wear and tear, as it is used many times throughout the day. Naturally, it can be disconcerting to find black slime in a bathroom sink. So, what is this black slime, and should you worry about it?

Biofilm, which looks like black slime or gunk, is present in the drain of many bathroom sinks. It’s a colony of microorganisms, bacteria, and fungi that feeds on loose hair, soap scum, and dead skin cells. This black slime can be dangerous if you don’t get the problem under control, as it can contain harmful bacteria and mold.

Before it gets out of hand, treat your bathroom sink with baking soda, white vinegar, and hot water. It’s also worth installing a drain stopper to keep hair and soap scum out of a drain. Follow along as we take a deep dive into the black slime in your bathroom sink and highlight some easy solutions to keep it away.

What’s The Black Gunk In The Drain In My Bathroom Sink?

The black slime or gunk in your bathroom sink drain is likely biofilm. It may look like dirt, but it's a community of microorganisms typically found in sink drains and consists of dead skin cells, bacteria, hair, and soap scum. This is more prominent in bathroom sinks than in kitchen sinks because people wash their face, scrub their skin, and brush their teeth in the bathrooms.

There ends up being more dead skin and bacteria in the drain of a bathroom sink than in a kitchen sink. The black slime in your bathroom sink can also include fungi and algae. This unique microorganism community generates a slimy exterior that encloses it. That’s why it appears like a black, slimy gunk.

Is Biofilm Dangerous?

The biofilm in your bathroom sink can be dangerous, especially if it gets out of control. That’s because it can contain harmful bacteria and become a breeding ground for dangerous mold. This doesn’t mean you should panic when you find black slime in your bathroom sink drain. However, you should at least be aware of the dangers, especially with E. coli and harmful fungi.

Bathroom sink drains are already breeding grounds for mold, and biofilm can significantly increase the likelihood of its growth. The big problem is that biofilm can also fuel mold growth and help it spread from your bathroom to the rest of your house. Mold can feed on the dead skin cells, bacteria, and soap scum in a bathroom drain. As you run the water in a sink, you can disperse the bacteria and mold spores in the drain. This can increase the risk of respiratory difficulties, infections, and exposure to harmful pathogens.

How To Get Rid Of Black Sludge In An A Bathroom Drain

The biofilm in your bathroom drain is easy to get rid of. That said, you must get it right the first time, as interacting with it can release harmful bacteria and mold spores. Since biofilm will eventually form again, and you must keep up with it and regularly clean the drain. You can get rid of black sludge in your bathroom drain using several methods, such as:

Baking Soda And White Vinegar

The best way to eliminate the biofilm in your bathroom sink is to treat it with baking soda and white vinegar. Mixing baking soda and white vinegar results in a chemical reaction of bubbles and foam comprised of carbon dioxide gas, which creates enough pressure to dislodge obstacles, like biofilm and hair, in sink drains. Pour ¼ cup of baking soda into your bathroom sink drain, and then add 1 cup of white vinegar.

Cover the drain opening with a plug, a wet rag, or some paper towels to prevent gas from escaping and the drain doesn’t lose pressure. Set a timer for 15 to 20 minutes, then boil some water when there’s five minutes left on the timer. Remove the drain cover and slowly pour the hot water into your bathroom sink drain to dislodge the biofilm and other obstructions. Repeat this process as many times as needed to clear the black slime.

Use An Enzyme Cleaner

Many commercial drain cleaners can permanently damage your plumbing. That’s because they’re typically corrosive enough to eat through pipes. Alternatively, enzyme cleaners aren’t corrosive, and they can help you get rid of black gunk in your bathroom sink drain. The enzymes and bacteria in enzyme cleaners can break down bacteria and organic matter. This includes hair, dead skin cells, soap scum, mold, and mildew, which are present in many bathroom sink drains.

Enzyme cleaners work well, but only if you closely follow the instructions on the label. Pour the recommended amount into the drain and wait for the allotted period. Some enzyme cleaners are meant to sit overnight, while others are meant to sit in the drain for 15 minutes. Rinse the drain with hot water after the recommended waiting period and repeat the process until the biofilm is gone.

Clean The Drain Stopper

There’s a good chance that your drain stopper is covered in black slime, even if it’s just beneath the surface. This part of the sink takes the brunt of it when you wash your hands, scrub your face, and brush your teeth. Many people don’t clean their stoppers even when they pour vinegar or hot water down the drain, and that’s a mistake. Even if you clean the drain below, the biofilm will come back if you don’t clean the stopper.

Unscrew the pivot rod beneath the sink to remove the stopper. Fill a dish with distilled white vinegar, insert the stopper, and let it sit for 10 to 20 minutes. When the time is up, remove the stopper and scrub it with an old toothbrush to remove biofilm, hair, and soap scum. Soak the stopper in vinegar again, rinse it with hot water until it’s clean, and reattach the stopper.

How To Stop Biofilm From Growing In The Bathroom Sink

Biofilm will continue to appear in your bathroom sink, as the atmosphere is conducive to its growth. That said, you can do a few things to ensure it doesn’t get out of control and make your bathroom unsafe. Preventative maintenance is key, so rinse your drain with white vinegar at least once monthly.

Let the vinegar sit in your drain for up to 20 minutes each time, then flush the drain with hot water. You can also stop black slime from forming in your sink if you install a hair catcher. By keeping hair out of the drain, the biofilm won’t have as much to feed on and prevents rapid growth. A hair catcher can also prevent annoying clogs.

Summing It Up

The black slime in your bathroom sink is biofilm, which consists of many microorganisms, a colony that feeds on dead skin cells, loose hair, and soap scum, which are abundant in bathroom sinks. You can get rid of this black gunk by putting baking soda and vinegar in the drain, then flushing it with hot water.

Related :

• How To Clean A Kitchen Sink Drain
• Kitchen Sink Won't Drain But Not Clogged? (Fix It Now!)