Hydrophane Farmyard Louse Powder is a unique triple action formulation that has rapid and long lasting repellant activity against lice on horses and farm livestock. Hydrophane Farmyard Louse Powder gives lasting protection against lice. One treatment is usually suffcient but in severe cases or when re-infestation occurs repeat again after 5 days. Directions: Apply the powder directly from the shaker over the affected areas of the animal and rub or comb well into the hair so that the powder reaches the skin. Repeat in 5 day intervals if the problem persists.