You will need a good sprayer with chemical resistant viton seals or equivalent to apply professional pesticide concentrates . Inexpensive garden sprayers tend to leak and clog shut after just a few uses due to their seals and rubber parts depreciating. The sprayers below are recommended for professional pest control operators and we've listed some semi-professional models for do it yourselfers. These sprayers are well made, some of them will last a life-time with proper care.