How to Use Borax for Fleas on Pets
In addition to other methods such as using flea collars and flea shampoo directly on your pet, borax or boric acid can be used to kill fleas in carpeting and upholstery. Borax and boric acid are chemically related. Both work to damage the exoskeleton of the flea, causing moisture to escape. If baited, i.e. mixed in with something sweet like syrup, it can poison them. The website Total Flea Control can help with this and additional procedures to get rid of fleas. Does this Spark an idea?
Instructions
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Vacuum carpets so that dirt doesn't block subsequent application of the powder.
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Sprinkle the boric acid or borax on the carpet and upholstery, and then sweep it deep into the fibers with a broom or hand brush. Do not let children or pets onto the carpet and furniture until it is vacuumed up.
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Wait 24-36 hours before vacuuming up the powder. Dispose of the vacuum bag so any live fleas don't escape the vacuum and reenter your home.
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Repeat the process for up to 3-6 weeks. Although borax and boric acid kill larvae quickly, adults can take weeks to kill off.
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Tips & Warnings
Since the fleas live on your pet, not just in the carpet and furniture, boric acid/borax should not be your only approach to killing fleas. See the website Total Flea Control for more ideas.
Do not apply borax or boric acid to pets directly.