What To Put In Humidifier To Prevent Mold?

A humidifier must be your go-to remedy if you have dry, skin irritation, allergy, or asthmatic. A humidifier gives quick, relaxing comfort by adding moisture to the skin. Humidifiers, on the other hand, employ heat and water, which, unfortunately, produces the ideal habitat for mold to thrive.

There are various things you could do to avoid this, including cleansing the water reservoir of your humidifier regularly. You could also add various additives to the humidifier’s ground to reduce mold growth and scale formation.

What to Put in Humidifier to Prevent Mold?

Cleaning the water tank is all it takes to keep mold from forming in your humidifier. It is indeed actually quite simple:

  1. To begin, drain the water reservoir.
  2. After that, rinse this with a mixture of very warm water with white vinegar. (This has antifungal properties.)
  3. Thereafter, remove any scale or mold with a thick cloth and a lime-based cleanser.
  4. Wash the tank with really hot water once more.
  5. Before reassembling your humidifier, put its reservoir away to drain.

However, merely cleaning your humidifier might not always work. In that case, go through the materials below that shall keep the mold and bacteria away from your precious humidifier!

Related reading: Best Humidifier Review


Vinegar is indeed a powerful cleaning agent that may be used to kill mold as well as mold spores. It is also antibacterial and antiseptic, so it’ll keep spores from developing in the container for a long time.

Remove the rubber belt and decontaminate it with vinegar. Because the rubber belt is an obvious victim of microbial growth, it should be conducted regularly rather than periodically. Other chemicals such as humidifier pills, bleach, tea tree, even hydrogen peroxide could also be used.

Mold-killing humidifier tablets are available, but they are more expensive than using vinegar or other home remedies.

Humidifier Tablets

These tablets can be purchased online or even in a local retailer. They’re made to keep mold and lime from growing within the humidifier. Simply place 1 pill in the reservoir only with the proper quantity of water.

Humidifier pills are available at most food stores and can help prevent mold as well as lime buildup in the humidifier’s storage tank. It is suggested that you take one tablet each time you fill it up with water.

White Vinegar

White vinegar, which is both antimicrobial and antibacterial, is an effective mold preventative. One cup poured into the water reservoir of your humidifier will make it work properly. To combat mold formation, add one quart of white vinegar into the liquid in the humidifier.

This is a natural antioxidant and anti-fungal material that’s healthy for your humidifier as well as the air you breathe.

Tea Tree Oil

A few droplets of tea tree oil throughout the humidifier fluid would not only avoid mold formation but will also help patients with respiratory illnesses like asthma breathe easier. Tea tree oil is indeed a purified essential oil extracted from the renowned Melaleuca plant that has antiviral, antimicrobial, and antibacterial effects.

Important: do not use tea tree oil if you have pets – tea tree oil is toxic to cats and dogs!

Tea tree oil serves two functions: it is a biological disinfectant as well as a respiratory aid that can help patients with allergies and asthma disorders. It’s antimicrobial, antibacterial, as well as antiviral, just like hydrogen peroxide. Five or six drops in the storage tank of your humidifier will suffice.

Hydrogen Peroxide

Hydrogen peroxide, another of the cheapest alternatives for controlling mold in humidifiers, eliminates germs and mold. Only a few drips into the storage tank are required to complete the task. Hydrogen peroxide is indeed a cheap and effective antibacterial and antifungal agent.

Each time you check the water tank, put half a teaspoon in there to prevent mold and germs from forming.

Related reading: Does A Cool Mist Humidifier Make the Room Cold?

Additional Tips

To prevent mold in your humidifier, there are some other techniques that you have to follow including not using any tap water and keeping the humidifier dry.

Say No to Tap Water!

Apart from disinfecting on a regular basis, you should also take additional precautions to avoid mold from developing in the first instance. Tap water is mineral-rich hard water that aids and accelerates the formation of mold spores.

When you fill the humidifier container with distilled water rather than tap water, the humidifier will create fewer harmful bacteria and other germs, which can be detrimental to human health if inhaled.

Related reading: Best Water For Humidifier

Take Care of the Filters

Although the humidifier’s filters serve to separate microorganisms from clean air, they might potentially be bacteria themselves. Filters should be changed at least once every three months or even before the inception of the next season.

Even better, you may go with filter-less humidifiers that don’t need to be replaced and don’t harbor mold.

Related reading: Can You Use Humidifier Without Filter?

Keep it Dry!

When moisture levels rise and the air becomes more permeable, you may reduce the use of a humidifier or perhaps even switch it off completely. There’s no need to be concerned because the machine wasn’t built to run all year.

Nevertheless, another key component in mold avoidance is the way your humidifier is stored. Clean all of the parts carefully and air dry thoroughly for days until there is no humidity left within the humidifier before storing it. Insert a baking soda packet in the container when it has dried before sealing the top.

It will absorb any remaining moisture and inhibit mold growth, as mold thrives in moist environments. Even during the winter or chilly season, the humidifier would be refreshed and ready for use.

Follow Instructions

The manufacturer includes a user manual on every humidifier. It’s indeed critical that you observe the supplied instructions for optimal device care. You should follow the guide’s instructions if it specifies not to use essential oils or other oil inside the humidifier.

For optimal outcomes and a long-lasting condenser, use the provided tools or follow the cleaning technique described in the instructions when cleaning your machine.

Related reading: How To Humidify A Room Without A Humidifier?

Bottom Line

Sure, you adore your humidifier, yet when did you give it a thorough cleaning last? Mold can quickly grow in a filthy humidifier, spreading bacteria and spores through your household. Cleaning on a daily basis is the clear set to avoid mold, particularly if you’re using a little humidifier. Mold may be prevented in your humidifier by changing the water, washing the tank with just a gentle brush, or using pure water.

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One Comment

  1. Mold grows easily when there is too much moisture in the air. Daily cleaning helps prevent mold from growing in your humidifier. You should change the water regularly, and clean the humidifier with a light brush. Distilled water is better than tap water because it doesn’t contain any minerals or chemicals that could cause mold.

    Deen Atkins | O2 Mold Testing

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