Combat bait stations are designed for long-lasting effectiveness, to protect a home or business against roaches that wander in from the outside for up to 12 months.
It is recommended to use the Combat Bait Station as often as once a month to maintain optimal effectiveness. Reapply your bait every 3-4 weeks if you see roaches, or more frequently if the roaches in question are especially stubborn species, such as German cockroaches.