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1-10 HP Concentrate System Refills are insecticide refills for 55- gallon automatic spray systems. Developed over 40 years ago using the highest quality pyrethroids, HP is a premium formulation that has set the bar for effective automatic flying insect control in horse barns. It provides both quick knockdown and effective control against a broad range of harmful biting insects that include: Horn Flies, Deer Flies, Horse Flies, Stable Flies, Face Flies, Midges, Mosquitoes and more.