hey all, I read a solution for killing gnats that involved letting the soil dry out and then adding hydrogen peroxide to kill the larve, then adding sand on top of the soil to prevent more from coming.

my question is, how much hydrogen peroxide is needed to kill the larve? do I need to dilute it with water if it's already a 5% h2o2 solution?

pretty simple questions, just going off of your guyses experience here