diatomacious earth is made from old coral beds, mined now in desserts and such. It is not dangerous. You can mix it with water. It works by puncturing the skin and outer skeleton of the insect. I think for ticks they would not mind it a bit. Fleas its good, and other things. Mites etc. Its used in chicken houses to control mites. Its not a bad idea to put it in the window sills and door ways but I would not count on it to stop a tick.
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