You can't get rid of rats. It's an on going maintenance . You need to cover every bit of food at night. And none on the ground. Buy a few bait stations and buy Tom Cat to put in there. Do not think this is a one time deal. It's ongoing. I always feel that I'm doing well when no bites are taken out of the bait for days. Traps and such are fine but how well does it work when you catch a few and there are 50 still there?