2 of 3 people found the following review helpful
My rats seem immune to this,
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This review is from: Rentokil PSBN804 Rat Killer 1kg (Garden & Outdoors)
I was pleased at first with the speed that the bait was disappearing but started to get suspicious when near the bottom of the tub as rats seemed to be thriving. Eventually they ate the whole tub and seem to have suffered no ill effects. Am now trying bait containing a different chemical.