This item is 9.0 ml Elector PSP in a single use dropper bottle. The 9 ml concentrate must be diluted in one gallon of water and will treat at least 50 chickens. If your chickens suffer from mites, then this is the best solution! I have tried lots of products and this is by far the best. It completely gets rid of mites and their eggs! Elector PSP is the most effective, safest, easiest solution to eradicating mites and lice in your flock with NO egg WITHDRAWAL period! Elector is safe for you and your pet chickens. Due to its multiple mechanisms of action, mites and lice do not develop resistance to it. Elector PSP kills adults and their nits after ONE application when used properly. Must be stored in a cool, DARK location until use; light degrades the active ingredient.