Draw Chalk Lines Around Your House to Repel Ants: A nontoxic solution which works because for some reason ants won't cross a chalk line.
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from Kitchen Stewardship | A Baby Steps Approach to Balanced Nutrition
How to Naturally Get Rid of Ants in your House
natural ant killer spray....get rid of little black ants in the house...also line treatments that ants won't cross (black pepper, baby powder, cornmeal, cinnamon, chili powder, cayenne, chalk)