Vacuum thoroughly afterwards, seal the vacuum bag, and dispose of it. This is a hormone which prevents eggs and larvae from developing into reproducing adults. IGRs don't actually kill adult fleas, so you may want to combine it with an insecticide. If the water pan test shows no evidence of fleas, apply a preventative spot treatment to each cat once every three months. Finally, keep your cats indoors.
Statistics show that indoor kitties pick up fewer fleas than their roaming cousins.
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