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Pyranha 1-10 HP Concentrate - 2.5 Gal. Refill for 55 Gallon Systems. (0.55% Pyrethrins). Add contents of entire container to drum and fill with water. 1-10 HP Concentrated System Refills: Are insecticide refills for 55-gallon automatic spray systems. Developed over 30 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 long lasting protection against a broad range of harmful biting insects that include: Horn Flies, Deer Flies, Stable Flies, Boot Flies, Face Flies, Midges, Mosquitoes and more. May be mixed with ODAWAY to eliminate odors.