Pest Expert Formula P XL Fogger (530ml) is a fast-acting, highly-effective aerosol fumigation device. Measuring 530ml and containing the powerful active ingredient Pyrethrum, this fogger delivers rapid knockdown of even the most established infestations. Pyrethrum is derived from the African Chrysanthemum flower, meaning it is 100% natural and can be seen as a safer alternative to the traditional smoke bomb. Pest Expert Formula P Fogger is ideal for fumigating any room affected by flea infestations and leaves no residue on carpets, clothing or furniture.