During a major insect infestation of your home, clearing bugs from your carpet is an important part of controlling the problem. You can use boric acid on carpet if you take care to limit your family's exposure to it.
A naturally occurring compound, boric acid kills insects such as fleas and ants that are found in carpets. It irritates the exoskeletons of insects that come in contact with it. Boric acid works as a stomach poison, destroying the digestive system of insects that eat it.
To use boric acid on a carpet, sprinkle it over the infested area, and then work the powder deep into the carpet's fibers using a push broom. Let it sit for several hours, and then vacuum it up. You might need more than one application of boric acid to kill all generations of insects infesting your home.
Boric acid can make pets and children sick if they are exposed to it. You cannot use boric acid on a carpet without blocking the area off to keep people and pets away from it. It is not easy to remove all traces of the powder from the carpet, so there is a risk that your family will be exposed to boric acid once you use it.