Ortho 1 Gallon Home Defense MAX Indoor Insect Barrier Refill. It is a ready-to-use indoor insect barrier that kills and repels ants, roaches, spiders, fleas, ticks, and other pests. This refill comes with an electric spray wand for easy application. It has a 365-day duration of effectiveness and can be reapplied every 5-8 months. Apply indoors, kitchens, bathrooms, doors & windows, basements & outdoor wherever insects are a recurring problem. It dries up to 30% faster and leaves no stains or fumes.