There are a broad range of flea killers available on the market. Ranging from herbal remedies that act as flea repellents to toxic chemic bombs intentional to quick purify a home of pests, there is something for everyone. Before you select which flea killers you should use, there are several things that you should keep in mind. First, not all flea killers are safe for homes with pets or children. While treatments such as Borax soap can be very effective at stamp out fleas in carpets, they should not be used if there are small children who play on the carpeting. This is especially crucial if the children put things in their mouths. This can result in accidental poisoning of the children. Pets may also be prone to licking the carpeting, which can cause minor poisoning. Natural substances, such as Pennyroyal, Citronella and Lemongrass can be exploited as repellents, and should be placed where children and pets cannot easily get at them. While they are not as good as other products, ingesting some of the herbs exploited for flea repelling can be harmful.