Diatomaceous Earth. You can get it at a nursery, we also had a pool filter that used this. It looks like flour and has no chemicals. It kills bugs with skeletons on the outside. Just sprinkle it on the dirt. Good on fleas, you can even put it on the pets and it won't hurt them. Very safe to use around pets and children. I sprinkled it on the carpets when we had a bad invasion of fleas and it got rid of the fleas but is very hard on a vacuum. Now I set small bowls of it around the house when I see a flea. We use DE all around the house for fire ants and for fleas as we live in the country and have all kinds of critters coming through our yard. (04/12/2007)
I too, had the problem of small gnats flying around my lovely plants and seedlings. A neighbor told me about placing about 1/2 inch of fine sand into each pot I have. The gnats like to lay their eggs in the soil because it stays warm and moist. The eggs can't 'breathe' or hatch with the sand over the soil.
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