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Diotomaceous earth is great for a lot of soil borne insects but I've also found a 1" layer of perlite will do pretty good for a soil gnat infestation. I like to thoroughly water the soil, then add the layer of perlite. This gives maximum time to leave it undisturbed until the next watering, where I remove it from the topsoil and replace after watering.
A layer of fine sand is another alternative, but that hasn't worked as well in my room.
Hi Yahooka!
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