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I did the Ratsak trick recently for a roof-rat problem. I put the bait under the house where they seem to be making ingress-egress and after a couple of weeks, the activity in the ceiling stopped. Then a week or so later we had a good sudden rain incident and lo and behold - decomposing rat carcasses landed in the top collection point of my rainwater tanks flushed put of the gutter where they had died - so our domestic water is now a somewhatr dilutred rat soup. Very queasy when I think about it.
It seems that rats will head towards a water source when they have a gutful of the poison - so if you collect your rainwater, consider checking your gutters after poisoning. If you have covered gutters (we do as a means of keeping leaves etc out of them) you'll have to devise something else.
Peter
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