Beaphar's famous household flea spray. Kills fleas and crawling insects in the home for up to 3 months. Environmental flea control is an essential part of keeping your pets free from unwelcome parasites. Defest 3 Months is the product of choice when fleas have already established themselves in your home. Apply to all rooms to which pets have had access. Combine treatment with regular vacuuming and wash all pet bedding. Due to the nature of the flea lif-cycle once fleas have become established it may take several weeks to completely eradicate them. Read the label carefully before using.