Several types of anticoagulant baits are available. Grain baits or pelleted forms often are purchased in bulk or packaged in small plastic, cellophane or paper packets. Rats readily will gnaw into place packs and feed on baits. Anticoagulant baits formed into paraffin blocks are useful in damp locations such as sewers or gutters, where loose grain baits spoil quickly. Unfortunately, they are not accepted by rats as readily as other baits.
Anticoagulants also are available as sodium salts that are mixed into a water solution.
Since rats require water daily, they sometimes can be drawn to water stations. Water baits are particularly effective in grain storage structures, warehouses and other locations where water is scarce. They protect rodenticides from weather and provide a safeguard to people, pets and other animals. Establish bait stations in or around the perimeters of buildings where it is impossible to exclude rodents. Place fresh anticoagulant bait in these stations to control invading rats before breeding populations become established.