Borax for Fleas – 4 Quick Steps for Flea Removal

In this post, I’ve described how you can use borax (an old-time flea control). But why borax? Borax Flea KillerWell, it’s budget-friendly, effective and safe around kids, cats, and dogs. 

According to LSU AgCenter report, borax can help homeowners control flea problems in and around our homes.

It’s a great DIY natural flea control method. If your pet (either cat or dog) frequents the yard and later runs into the house, you should be worried as he/ she can carry fleas over.

1. 99% PURE BORIC ACID AKA Orthoboric Acid – Top Boric Acid 

99% Pure Boric Acid contains acidum boricum, orthoboric acid, boracic acid, hydrogen borate, and boric acid. Therefore, you can use this neutron absorber, flame retardant, flea control insecticide, or antiseptic.

99% PURE BORIC ACID AKA Orthoboric Acid, Boracic Acid Check Price On Amazon

How to use Borax to kill fleas safely 

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. 

Reviews: 7 Best Borax Flea Killers 2019

1. 99% PURE BORIC ACID AKA Orthoboric – Best Boracic Acid 

99% Pure Boric Acid contains acidum boricum, orthoboric acid, boracic acid, hydrogen borate, and boric acid. Therefore, you can use this neutron absorber, flame retardant, flea control insecticide, or antiseptic.

99% PURE BORIC ACID AKA Orthoboric Acid, Boracic Acid Check Price On Amazon

This 99% Pure Boric Acid contains acidum boricum, orthoboric acid, boracic acid, hydrogen borate, and boric acid. Therefore, you can use this neutron absorber, flame retardant, flea control insecticide (and Waterbugs or Palmetto bugs), or antiseptic.

You can use 99% Pure Boric Acid in crawl places, attic areas, wall voids, and plumbing chases to control the fleas, their larvae and eggs.

Further, you can treat fleas under electronic appliances, in ceilings, and inside clothing closets, and near drains. Luckily, you can use in a combination of flea killers or as a standalone flea treatment solution.

2. Borax 20 Mule Team Booster Fleas on Carpet – Runner-Up 

My vet advised using this Borax 20 Mule Team against a flea infestation in the yard, carpets or whole house. I left the borax flea killer on the floors for 2 days – remember to apply the fine powder under stove, refrigerator, and couch.

Borax Flea Killer

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In addition to killing fleas, borax will remove bad odors from your living spaces. You can pour the borax into areas where dogs and kittens do visit. Further, avoid watering the yard (and use it when there’s no rain) after applying borax as this can reduce its effectiveness. 

Generally, borax is used as a natural herbicide, cleaner,  floor cleaner, and rust remover. This 20 Mule Team Borax will kill fleas and other insects such as roaches but won’t kill them in their immature growth stages. 

First, I vacuumed the whole house and then the areas where I had poured the borax. Luckily, this product can be used as a color safe bleach, laundry booster, and a garbage disposal cleaner.

My vet advised using this Borax 20 Mule Team (definitely the best borax acid) against a flea infestation in the yard, carpets or whole house.

I left the borax flea killer on the floors for 2 days – remember to apply the fine powder under stove, refrigerator, and couch, which exterminated fleas and their larvae.

3. MILLIARD Borax Powder Multi-Purpose – Borax Flea Killer

MILLIARD Borax Powder, commonly used as a dish or laundry detergent, is created from sodium borate (anhydrous) without any preservatives or additives.

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In addition to killing fleas in the household, MILLIARD Borax Powder may act as a refrigerator deodorizer or for removing rust. It’ll help in making DIY ant killers and detergents, deodorizing and softening water.

The powders will leave no odor behind and won’t perish so will be highly effective for a long period if you store it under the recommended conditions.

MILLIARD Borax Powder will be great for using in baths and for laundry, carpets, and trash bins. In addition, normally most homeowners would use this borax powder in combination with magnesium as it’ll readily absorb minerals.

In addition, MILLIARD Borax Powder is great for controlling bed bugs and spiders that are in the crevices, garage, and store areas. I noted that you can make some small sachets to put inside bags containing bed covers or shoes.

4. Tranquility Products 10 lbs Boric Acid Powder 

Tranquility Boric Acid will be great if you’re having a flea infestation on your wooden floors, and cat or dog bedding, and carpers – eliminating the whole flea cycle: adult fleas, flea larvae and flea eggs.

Tranquility Products 10lbs Boric Acid Powder Check Price On Amazon

As an experienced flea exterminator, I would recommend using the Tranquility Boric Acid together with diatomaceous earth for fleas in cats. Most homeowners use to kill fleas under electrical appliances, under cabinets, and in the carpet lining.

Remember to flea comb your cat to get rid of flea eggs and flea dirt. Definitely, you must vacuum the carpet and floors thoroughly after treating with diatomaceous earth and borax.

5. JT Eaton 360 Answer Boric Acid Insecticidal Dust

Next up is this Answer boric acid which is made up of hydrogen borate (Orthoboric Acid) is a natural flea control and general cleaner. It’s composed up of a white powder or colorless crystals which will readily dissolve in water.

JT Eaton 360 Answer Boric Acid Insecticidal Dust Check Price On Amazon

Answer boric acid is a great bug control solution for fleas, ants, and cockroaches. You can also use it in your laundry as an algae cleaner that’ll hinder the advancement of stains or bacteria on the kitchen counter-tops or in the carpet lining.

Equally, this product will also kill fleas on wall cracks, under carpets and on your bed linen. So, I am happy to report that this borax helped me exterminate most of the bugs I had in the house including fleas and roaches.

6. 2 Pk, Boric Acid Fleas, Roach & Ant Killer 

This 2 Pk, Boric Acid for fleas will in addition kill ants and cockroaches.  So, whether it’s for your personal or rental apartment, this product will work great in killing the whole flea cycle.

2 Pk, Boric Acid Roach & Ant Killer Check Price On Amazon

All you’ll need is to sprinkle the boric acid powder all over your house to get the fleas and roaches in their hiding places. Luckily, it has a residue effect of about 2 months and thus will continue killing the fleas and their larvae over that period.

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

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 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 a safer and natural alternative when compared to boric acid. Borax is safe and not harmful to the human skin or 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 – Video


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