Rentokil Insectrol ant killer spray is highly effective in the treatment of ants and, despite being an aerosol, has a long lasting residual effect. Can be used in combination with Pest Expert Formula 'P' ant killer powder or on its own where the use of powder is not advisable. Very useful for application in hard to reach areas, such as under kitchen units, in cracks and crevices etc. A great all round insecticide for use anywhere inside or outside the home. (Active Ingredients: Permethrin 0.46% w/w & d-Allethrin 0.13% w/w 250ml size).