How to Kill Fleas With Borax & Rock Salt

Fleas are not only an annoyance, but they also carry disease. If your house is infested by fleas, first treat your pets to make sure the fleas don't have their favorite hosts. Then, treat your house to kill any remaining fleas and their eggs. A mixture of borax and table salt can kill the fleas and eggs, while rock salt deters new fleas from sharing your home.

Things You'll Need

  • Vacuum cleaner
  • Flea collar
  • Broom
  • Borax
  • Table salt
  • Rock salt
  • Lavender oil
  • Shallow bowls or trays


    • 1

      Cut your flea collar into several pieces. Place the flea collar in your vacuum bag or bag-less canister. This will help kill the fleas you collect as you vacuum your house.

    • 2

      Vacuum your floors thoroughly. Vacuum every room in your house, because fleas can quickly travel to different rooms and upstairs. Vacuum your furniture and drapes as well. Dispose of the bag or rinse your canister thoroughly with water and a 1/2 cup of bleach.

    • 3

      Mix four parts borax with one part table salt. Sprinkle the mixture over your carpet and upholstery. Use your broom to spread the mixture evenly across the floor and furniture and to work it deeper into the fibers. Leave the solution on for 30 minutes to five hours, depending on the level of infestation. The mixture penetrates the fleas' exoskeletons and the eggs' shells and draws out the moisture inside, killing the fleas.

    • 4

      Vacuum the floors and furniture again to remove the borax and table salt. Dispose of the bag or rinse your canister thoroughly with water and a 1/2 cup of bleach.

    • 5

      Mix 2 ounces of lavender oil with about 3 quarts of rock salt. Place the mixture in a shallow bowl or tray. Place it under furniture and out of reach of children or pets. The mixture will help repel fleas.

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  • Photo Credit Thinkstock Images/Comstock/Getty Images

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