m0useanswered grow question 8 months ago Yes they are.... lol
Nematodes the brand I have used and bought is not that expensive. They are not only for organic grows it works in all type of mediums.
https://www.amazon.ca/Nema-Globe-Beneficial-Nematodes-S-Feltiae/dp/B01N5TYSFU
16$
how much money have you wasted on other products to "solve" this problem? let alone your time wasted if it was convered into billing hours with a wage..,,
lot more then 16$ I bet. and how much is boxes of peroxide....