What To Put In A Humidifier To Prevent Mold (5 Simple Solutions!)

Preventing mold in your humidifier will make it last longer and keep you from getting sick.

You can do a lot to make sure mold doesn't grow and a lot of solutions you already have in your home.

If you don't they are super easy to get!

In this article you will learn:

What To Put In A Humidifier To Prevent Mold
  • How to prevent mold using tea tree oil, bleach, white vinegar and more
  • Common mistakes you are making that's helping mold to grow
  • And much more....

What To Put In A Humidifier To Prevent Mold

If you want to prevent mold in your humidifier then there are a few simple things you can add to the water including: 

Tea tree oil, bleach, white vinegar, hydrogen peroxide, distilled water, and humidifier treatments.

Read Also: How Close Should A Humidifier Be To A Baby

Let's dive into the best way to use each ingredient.

Tea Tree Oil

You only need a few drops of tea tree oil to completely stop mold from growing.

Tea tree oil is a natural disinfectant And you get the added benefit of it being an essential oil. It comes from the Melaleuca Alternifolia tree found in Australia.

The benefits of tea tree oil is that it's an all purpose cleaner, fights fungus, fights acne, helps soothe dry skin and much more. 


Bleach is another great way to kill mold that's formed already in your humidifier tank.

DON’T use bleach directly in the water while your humidifier is running.

You can put 1 tablespoon per gallon of water and use that to thoroughly clean your tank.

You can also let it sit for 10 to 15 minutes before cleaning it out. This process will get rid of any mold in your tank. 

White Vinegar

White vinegar has antimicrobial properties that will help eliminate any mold in your humidifier.

If you want to just clean your humidifier you can use a 50/50 ratio of white vinegar to water. 

You can also mix 1 to 2 cups of white vinegar into your water. You can use this mixture while your humidifier is running.

Hydrogen Peroxide

Hydrogen peroxide isn't just good at cleaning cuts it's also good at cleaning out your water tank.

All you need are a few drops of hydrogen peroxide and you’ll be good to go.

This is a very affordable solution to dealing with mold and you probably already have it under your sink. 

Distilled Water

Like I said earlier, tap water should not be used in your humidifier if you're trying to prevent mold.

If you aren't going to use any of the other options I’ve told you about then distilled water is a great choice.

Read Also: Can You Use A Humidifier If You Have Cats?

Distilled water does it have the mineral deposits that tap water has so mold can't form.

This is probably the cheapest and easiest way to prevent mold before it starts.

Humidifier Water Treatments

The last way to kill mold is to use humidifier treatments. You can check out a bottle of humidifier water treatment on Amazon by clicking here.

This particular water treatment works by stopping the deposits from forming in your humidifier.

The deposits are the food for mold so that it can thrive and grow.

It also eliminates bad odors and is safe to be used around babies! 

Mold spores are dangerous

Mistakes You Should Avoid

There have definitely been times when I've been too lazy to to deal with my humidifier.

Read Also: Best Humidifiers For Singers

Then I have to go through the pain of having to clean the humidifier out. But there are a few simple things you can do to avoid these mistakes. 

You Don’t Clean Your Humidifier

Not cleaning your humidifier regularly can lead to mold growth.

That will make your air quality way worse because you'll have mold spores, bacteria, and more horrible things in your air.

I highly suggest that you clean your humidifier at  the very least once a week. all it takes is  warm water and soap and a little TLC. 

Forgetting To Empty The Tank

Allowing your water to sit in the tank for more than a day is like a gift to mold.

Water left in the tank will let mold and bacteria grow wild especially if it's in a hot humid room. 

Make sure to empty the leftover water after every use.  

If you aren't going to empty the water, don't leave the humidifier in direct sunlight  because mold likes warm water.

Using Tap Water

Tap water is another mistake that you should avoid. Tap water has mineral deposits that help mold grow. 

If you are going to use tap water make sure you add something in it to stop mold from growing.

How Does Mold Form In Your Humidifier

Mold loves the form in warm places. A water tank of standing water is the perfect place for mold to form.

A.K.A your humidifier tank.

What's worse...

is that the mold will begin to spread when it's dispersed from your humidifier. Which can also cause you  and your family health problems.

Read Also: My Favorite Humidifiers To Get Rid Eczema

The main culprit of this problem might surprise you. tap water makes it easy for mold to grow because they use the minerals in it as food. 

It's best if you change the water frequently so bad you don't have to deal with this problem.

Use hot water and soap and  washing it out once a week should do the trick! 

Are The Mold Spores Spread By Your Humidifier Dangerous

Yes they are!

When you have mold growing in your humidifier it will also spray out the spores which can be dangerous to your health.

You can think of these spores like do you think about a bug infestation. Once it begins to spread you'll start to see mold growth all over your house.

Breathing in the mold spores can be a big problem for people that have allergies or breathing issues.

There's a study that shows the long-term effects of breathing in mold spores can cause neurological impairment.

Also if you have asthma attacks you should be especially cautious. Because mold can cause you to have attacks much more frequently.

The Bottom Line

Mold growth is not only disgusting but it can also harm your health.

But it's very easy to deal with the problem and prevent it from ever happening again.  

After you've cleaned your humidifier you can either add white vinegar, bleach, hydrogen peroxide, tea tree oil, distilled water, or humidifier water treatments.

This will prevent mold from growing and some of these ingredients will have an added health benefit.

Stay healthy and enjoy your clean air!

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