Sorry for the late response. Have been in the sticks with no web.
The Eco Granuals worked wonders. They are a bit smelly (like super strong wintergreen) but it's non toxic.
What I did was first remove the top 3 inches of soil and get rid of it.
Then I watered with a soil drench of 1oz of
Azamax per Gallon of water.
After that I applied a fresh top dress of clean soil about 3 inches.
Finally I topped that off with an even covering of the Eco Granuals.
They won't work when wet, so you can't water with them on. You have to remove them, water, top dress with dry soil, and then apply.
My Vortex was majorly infested and not one single bug surfaced. Found a few dead flies on the top. Not many.
All in All I would say this is the way to go for soil dwellers if you want to stay non toxic.