I wondered the same thing myself and switched down
OF to Roots Organic Original for my first all indoor grow.
A couple weeks later, I see a gnat crawling around. Just one, but there’s probably more that I don’t see.
Now I’m left thinking I can’t control my environment enough to be sure it’s the soil. There’s a lot of variables to control for.
I mixed my soil outside. Soil could be clean, but are my amendments? Did a gnat just fly by at the right time?
I used a spade that I kept outside. Was it contaminated?
I carried the newly potted plants directly from outside to the inside tent. Did a bug catch a ride on my clothes?
The tent itself is not hermetically sealed. There are a couple gaps where the zippers meet where a determined bug could make it in.
That said, Roots Organic Original was not teeming with gnats as far as I could see.
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