7 Borax Flea Killer in 2019 – Safe Flea Removal

Borax for flea is a popular DIY natural pest control method. Fleas, the tiny bloodsuckers, can cause you unwanted pain, diseases, and embarrassmentI’ll outline how you can use borax to control fleas on your dog and on your yard. 

Summary: I recommend either this Borax 20 Mule Team Booster or the MILLIARD Borax Powder as the best Borax Flea Killer. There is increased interest in old-time flea control such as borax. 

Reviews: Our Best 9 Borax Flea Killers in 2019 

1. Borax 20 Mule Team Booster Fleas on Carpet – Our Top Pick

The Borax 20 Mule Team is effective in treating fleas in the carpet and the house. You can pour the borax into areas where dogs and kittens do not visit, and the sofas. 

The product is a fine powder that effectively works against any flea infestation. 

First, I vacuumed the whole house and then the areas where I had poured the borax. 20 Mule Team will also remove odors from your house and kitchen. Further, it helps remove stains from the house. 

2. MILLIARD Borax Powder Multi-Purpose – Runner-up

MILLIARD Borax Powder - Pure Multi-Purpose Cleaner

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3. 99% PURE BORIC ACID/Orthoboric Acid

99% PURE BORIC ACID AKA Orthoboric Acid, Boracic Acid

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4. Tranquility Products Boric Acid Powder

Tranquility Products 10lbs Boric Acid Powder

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5. Answer boric acid insecticidal dust 

Answer boric acid insecticidal dust, 16 ounce puffer bottle

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6. 2 Pk, Boric Acid Roach & Ant Killer

2 Pk, Boric Acid Roach & Ant Killer NET Wt. 1 Lb. (454 GMS) Each

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How to use Borax for killing fleas safely in Four steps

Step 1: Choose the best borax brand for flea treatment. Vacuum your house thoroughly ensure you attack the insect in all its life cycle stages.

Also, consult your vet for advice on the best brand depending on your dog’s age (if a puppy), pregnancy, or if the dog is under other insecticides treatment. Ensure that you reach and clear fleas from their hideouts such as under carpets, in cracks and crevices.

Step 2: Treat your dog’s play area thoroughly with various flea treatments. Target the borax flea treatment to the areas where your dog frequents.

If you note that your dog’s playmates have fleas, you may consult with their owner on the possibility of undertaking a parallel treatment plan on their pets too. 

Also, if your dog has a large flea infestation, you should place him in an outside shelter, after treating him. Use that time to treat the house for fleas using borax.

Step 3: Consult your vet on the best deworming medication for your dog as the flea larvae tend to host tapeworm eggs.

Note that tapeworms can put the health of your dog in danger if you don’t have them in time. In using borax to kill fleas, you will need to powder borax in areas where your pets frequent such as the bed, sofa, carpets and in nooks and crannies.

Step 4: Let borax work for a few hours in the area; it will dry the fleas, eggs, and larvae out and killing them in the process. Treat one room at a time; do not allow your pets to the area as you clean it. Do not treat pets with borax or feed them with borax. 

You may use this treatment regularly to make sure that all the fleas in your home are gone. Vacuum your floors, carpets, and sofas frequently to assess for fleas. Make sure that the vacuum is emptied and the reusable vacuum bag is cleaned.  

How does Borax Kill Fleas?

Method 1: As a powder, Borax has no smell and can be used to control fleas by dehydrating them. The borax powder breaks the fleas’ exoskeletons and enters their body, which leads to dehydration and death.

Method 2: As the flea larvae hatch, borax dehydrates the fleas’ outer tissues and kill them. Therefore, borax stops the flea from hatching.

Method 3: Also, borax contaminates the food preserves for the flea larvae. The larvae then feed on the contaminated food (mainly droppings by adult fleas) and get ripped to death.

How to use Borax for fleas in Yard & Lawn

If your pet frequents the yard and later runs into your house, you should be worried about him carrying fleas from the outdoors into your comfy home. Borax is both cheap and easily available alternative for natural flea control in your yard. What you’ll require to control fleas in your lawn: Borax powder, salt, sprinklers or water hose, and diatomaceous earth. But you can also use the Best Flea Spray for Yard

Precautions: Wear gloves and cover your face using a dust protector. Borax powder can cause significant throat and skin irritation if you do not take the safety precautions. 

First: Clear your Lawn or Yard – Remove any obstacles such as containers and movable furniture. This will make it easier to apply the borax on your lawn.

Step 1: Choose a Dry Day and week

Borax will be useful in treating fleas when there are low moisture levels in your garden. Therefore, treat your yard when there is no rain or any rain forecast in that week. Also, turn off your water sprinkler system.

Step 2:  Mix Borax, diatomaceous earth, and salt.

To achieve the highest effectiveness, mix one part of two parts of borax and diatomaceous earth with one part of salt.

Step 3:  Sprinkle borax on your lawn

Ready? Go! Sprinkle the borax mixture on your lawn using a hand trowel. You will need to reach all the corners of your yard and cover it maximally on the surface.

Also, ensure to maintain the dry atmosphere on your yard 2-3 days after the borax application. The time allowance will allow the borax to dehydrate the fleas, thus killing them.

Step 4: Spread the Borax

Use a tool such as a rake to spread the borax on the yard to ensure that the powder gets to all the plants and grass. To avoid poisoning and contamination, ensure that no human being or animal steps on the yard for about 2-3 days. Note that if your pets ingest the borax mixture, it might get poisoned.

Step 5: Water the Yard

After 2-3 days, water the yard to wash away the borax moisture. Check whether there are signs of live fleas and if you find any repeat the treating process. Always ensure to repeat the process once after 15 days to make sure the fleas and their eggs are all killed.

In addition to treating your yard, you will need to treat your house using best fogger for fleas to control the fleas from residence from inside and outside. You can find borax in an online store or the physical grocery store, particularly in the detergent section.

Borax for fleas on hardwood floors

Is it possible to use borax for fleas to exterminate hardwood floors? Just like you can use borax to treat your lawns, it can also be applied on your hardwood floors.

Step 1: Clear then furniture and carpets and vacuum the whole floor space. The process will help eject all the fleas that could be hiding under the furniture and carpets. Also, vacuuming will eject flea larvae from their cocoons.

Step 2: Sprinkle the borax for fleas powder on the hardwood floors in your residence. Further, ensure to sprinkle the powder on furniture and the carpet.

Step 3: Spread the borax powder in the hardwood floors to ensure it reaches all the cracks and crevices.

Step 4: Leave the room with your pets for 6-10 hours to allow the borax powder to work on killing the fleas and their larvae.

Step 5: Vacuum the floor after the break and remove all the borax residues that could be on the floor. Also, continue with the vacuuming process for the whole week.

Step 5: Repeat borax application process to ensure that the fleas in the whole flea cycle are eliminated from the hardwood floors. 

What is Borax for Fleas?

Borax (Na2B4O7• 10H2O) (disodium tetraborate, sodium tetraborate, or sodium borate) is a boron compound, boric acid salt and a mineral. Mainly, you’ll find borax as a powder that readily dissolve in water.

Borax flea killer

Borax Kill Fleas on Contact

Notably, Sodium Tetraborate (known as borax) is described as a boric acid salt but it is not chemically similar to boric acid (hydrogen borate).

Borax is an active ingredient in detergent soaps and toothpaste and can help reduce flea infestations. As a homemade pesticide, borax is mixed with sugar to kill fleas, roaches, and ants. Also, you can check borax products on Amazon and eliminate the whole flea life cycle: eggs, larvae, and adults.

In addition to using borax on fleas control, you can also use them on other bugs like cockroaches and moths. It is also a cheap way to get rid of fungus and weeds in your garden. In different industries, borax is used as a flame retardant, for bleaching purposes and to glaze enamel.

Where to buy borax for fleas

Although borax has many domestic and commercial applications, buyers usually find it challenging to locate borax products in the stores. Outlined are places where you can purchase borax:

Swimming pool supply outlets; Farm supply and Grocery outlets

Hardware shops; Health food shop

Amazon and other Grocery outlets – laundry detergent section

However, if you are unable to locate borax in your local hardware or store, you can purchase borax online from Amazon.

You will most likely come across the borax labeled “20 Mule Team” in the local stores. You can check online reviews and the “20 Mule Team Borax” Amazon ratings.

But, what diseases can you get from fleas?

Fleas can transmit the following diseases: (1) Mycoplasma haemofelis (2) Murine Typhus (3) Cat Scratch Disease (4) Tapeworms and (5) flea allergy dermatitis (FAD) in cats and dogs, which is reported to be above 50% of the vet testified cases.

Is borax safe cats and dogs (Pets)?


Did you know there a difference between Borax and boric acid powders? Most pet owner’s use the above terms interchangeably, which could lead to dangerous outcomes if one is not keen the one they use on their dog or cat.

It is important to know which one, between Borax and boric acid, is the recommended natural flea treatment option. Also, you should be aware of the safety precautions you should take while using borax to treat fleas on your cat.

Borax vs. boric acid powders: which is safer?

Both Borax and boric acid powders are derived from boron. Notably, borax has mainly been used for glazing and welding and also for pharmaceutical purposes.

As a drug product, Borax is known to act as a fungicide and antiseptic and is utilized in the healing of eye infections. Boron exists nature is made up of boron, sodium, and oxygen. However, boric acid is made from borax mixed with an acid. Both borax and boric acid can be used to treat pest infections.


You should note that borax is the safer and natural alternative when compared to boric acid. Borax is safe and not harmful to the human skin or the pets. On the contrary, borax raptures the fleas’ skin and absorbs its body moisture, and thus kills it.

Also, borax has a crystalline structure that allows it to slice the fleas’ internal organs and thus kills both larvae and adult fleas.


Since borax is naturally derived from boron it is considered less toxic to your dog, cat, and thus safer in treating a flea infestation. However, ensure to follow all the product label instruction to avoid accidents.

Other uses of Borax Powder

1: Borax for ants, moths, and cockroaches – Apart from just treating fleas, borax can be used to treat other insects like moths and ants. You will need to sprinkle borax in the cabinets, and storage areas. Also, borax will be effective in treating bed bug, insects that are very troublesome.

2: Borax to kill fungus – Do you have a fungus problem in your house? It is time you tried borax! Fungus and molds require wet atmospheres to grow. Borax will dry the various surfaces and thus prevent them from increasing.

3: Borax weed killer – Borax will effectively kill weeds around your home and in the lawn. You will require only to sprinkle some borax on the weeds. Further, borax will not harm your plants and grass. However, treat the weeds in sections if you have a big lawn.

4: Borax for clothes – Is your detergent very effective? Well, if not, you should try borax as it is a safe detergent for your clothes. In addition to making your clothes brighter, borax will also make them shine.

5:Borax used as a home cleaner – If you need to clean house objects and surfaces, borax is an excellent choice. It is quick and tough on stains and dirt without the need to use too much effort.

Best Borax Substitute: Diatomaceous Earth Powered

The borax alternative for killing flea naturally is Diatomaceous Earth. Diatomaceous Earth (DE) has razor sharp edges, which cut the fleas’ outs shell and absorb their body fluid.

Diatomaceous earth is a remain of the sea and wetland algae, particularly a type of hard-shelled phytoplankton or plankton. Similar to borax, DE is mined from underground, and it is a natural pest control method. Later, the DE powder is crushed into very fine powder.

Equally, DE is considered a safe flea prevention alternative to borax. If you purchase DE that is labeled food-grade, you can use it to deworm, both humans and animals.

It will take DE about 24-72 hours to kill the fleas in your home. Also, the DE powder will kill any other fleas that will emerge from their cocoons within that time.

Finally: How To Use Boric Acid To Kill Fleas in Carpet