Does Borax Kill Fleas

Fleas follow the golden law of intruders and pests in the home: where there’s one, there’s always many more. As a result, many homeowners seek an all-natural treatment to combat flea-infested carpets.

Fleas can be treated with various home remedies, including recipes comprising dish soap, salt, coconut oil, and even Diatomaceous Earth. Many homeowners have the dilemma of switching from remedy to remedy whenever they don’t really see results.

For treating your home against killing fleas, this will be the quickest way to fail. You must choose a solution and adhere to it for a sufficient period to assess the results. (Learn About Plants That Repel Fleas)

A Borax mixture is another household chemical people use to kill fleas. So, is it true, and does borax kills fleas and eggs? In a nutshell, Borax kills fleas.

Borax powder to treat your home for fleas

There are, however, some things to keep in mind when using Borax powder to treat your home for fleas, such as the fact that Borax and Boric Acid powders are not the same things.

Fortunately, our tutorial will teach you everything you need to know about using Borax to kill fleas and keep your home healthy and clean.

How Long Does it Take Borax to Kill Fleas?

Borax can treat flea-infested carpets since it kills fleas and flea eggs. Fleas carry the disease Murine Typhus, so they need treatment.

Borax is a desiccant, which means it causes dryness in the areas where used. By absorbing moisture, Borax kills adult fleas, flea eggs, and flea larvae by drying them out.

Boric acid is more effective for pest management indoors since it deals with a wider spectrum of pests.

It also works as a desiccant, and Boric acid powders are harmful to pests by disrupting their nervous systems and weakening exoskeletons.

As borax and boric acid are effective in fighting flea infestations, you have a choice.

Boric acid is more expensive, but you could have borax in your home already as a laundry product, so it should be your first choice. (Learn How to Make DIY Mosquito Repellent)

It is worth noting, you can find borax not killing fleas eggs, and as a result, you may need reapplication once this hatch.

How to Treat a Flea Infestation with Borax

Follow these methods to destroy fleas and flea eggs using borax as the flea life cycle isn’t short, as with many other pests.

  1. Thoroughly vacuum your carpets.
  2. Apply borax to infested areas.
  3. Follow safety procedures.
  4. Brush the borax powder into your carpet using a stiff brush.
  5. Leave the borax for a minimum of 6 hours or up to 2-days for the borax to work. (The longer you leave it, the more effective).
  6. Ensure no pets or children can access the carpet.
  7. Thoroughly vacuum your carpets and use your vacuum hose to reach difficult-to-reach areas as flea larvae can burrow into these.
  8. Dispose of used vacuum bags in an exterior trash can.
  9. Re-infestation can occur if fleas are not removed properly.
  10. Pets should be given a bath, combed, and treated during this time.
  11. Borax is hazardous to animals and should never be used on pets.

Here you can see the difference between boric acid, borax and, how this DIY pest control can affect you, and why safety precautions are essential.

Sodium borate (sodium tetraborate or disodium tetraborate), known better as borax, is an alkaline mineral salt. It is a white powder and often mistaken with boric acid as they both come from the same compound, Boron.

Borax is mined, where Boric acid is made by mixing borax with strong acids, such as hydrochloric acid.

Boric acid crystals are filtered and ground into a fine powder. While different, both are harsh chemicals, and you could wonder, is borax dangerous for treating a flea infestation?

Borax is widely used in the laundry room as it is mixed with laundry detergent.

Besides this, many antiseptics, insecticides, and flame retardants all include boric acid. You can find in trace amounts, both borax and boric acid are in cosmetics. (Learn How to Make Natural Deer Repellent)

20 Mule Team Borax Natural Laundry Booster

Is Borax safe for pets to be around?

Borax and boric acid may be great at pest control overall and killing fleas in particular; however, they can be toxic to people and pets.

If animals ingest a sizeable amount of borax or boric acid, it leads to vomiting, swelling of the throat, and airways and affecting other internal organs.

Because of this, pet owners need caution when used around young children and dogs, and pets.

Borax and boric acid are linked to soap making, and one of the most common uses is when you buy borax as a laundry booster 20 Mule Team Borax. You can find it is often because of this people ask if they can use laundry detergent for fleas? It is also often used as part of floor cleaner, rust remover, and a natural herbicide.

When using either, always wear protective gloves, and if using in an enclosed area, wear a face mask.

If you come into contact with either an active ingredient, it should be diluted to safe levels. If using them to treat a flea infestation, follow the advised safety precautions.

The high alkalinity of borax means it quickly becomes a health risk or irritant when in contact with skin, eyes, or inhaled.

Symptoms and toxic effects from contact with borax powder include:

  • Eye infections
  • Oral irritation
  • Human Skin irritation
  • Nausea, vomiting, and respiratory issues
  • Pregnant women must stay away from borax

Most of the worst symptoms or effects occur when the powder is ingested. Any pet or child who swallows it could face a trip to the vet or the hospital.

What Can Kill Fleas Instantly?

Fleas feed off the blood of animals and can be a problem in your home. Borax can kill fleas and other insects that feed on blood or plant juices.

Flea bites on humans are rare, and it is most often dogs that are the victims.

You can find many homemade flea remedies to help get rid of adult fleas instead of using borax to kill fleas.

Dish soap

Make a flea trap using dish soap and water. The water and dish soap act like glue trapping the fleas. Repeat daily for repeat safe flea control. (Find the Best Pet Safe Weed and Feed)

Herbal Flea Spray

Mix 1 gallon of vinegar, 1/2 gallon of water, 500 ml of lemon juice, and 250 ml of witch hazel. Add to a spray bottle and spray around your home for flea control.

Baking soda

Vacuuming is one of the most effective ways to get rid of fleas. Use baking soda to increase the effectiveness. Apply as you would sprinkle borax for flea control, use a stiff brush with the baking soda, and vacuum treated areas.


Salt can be a natural way to treat fleas when accompanied by your vacuum, as it is another natural compound that absorbs moisture and dehydrates fleas and other insects.

Diatomaceous Earth

Diatomaceous earth (use food grade) a very fine powder made from naturally derived fossil remains. It is another compound and effective natural solutions that cause dehydration like borax for fleas. Sprinkle the natural mineral mixture liberally over areas with a flea problem. Leave for 2 days and vacuum properly.

Borax kills fleas and eggs

How Long Can You Leave Borax on Carpet?

When you have fleas in the carpet, borax can be an effective method to get rid of them.

However, borax for fleas means you need to keep pets and children away from those areas.

In powder form, borax leads to dehydration in the fleas and ultimately kills them. It comes from the same element as boric acid but isn’t the same thing and works differently.

Fleas reproduce every three to five days, so when your borax treatment kills one cycle, it is possible you need to repeat treatments two or three times to control the issue.

In each application, you would leave the borax on your carpet for two days to be effective.

While you can readily buy Borax, you need to take precautions in its use. Besides this, it isn’t a one-shot solution that will rid your home of fleas in one go. Besides, you have the flea’s eggs to deal with, and these are the reason it’s hard to get rid of a flea infestation so quickly.

One of the toughest challenges is that you need to keep children and pets away from the treated area for around two days at a time. With further treatments, you could find your carpet off-limits for almost a week as you treat that particular area.

Borax is an effective cleaner and way to deal with fleas, yet it offers its own set of hazards and challenges when you use it.

Does Borax Kill Fleas

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