There is a naturally occurring soil bacterium called Bacillus thuringiensis subspecies Israelensis (BTI) that kills the larvae of fungus gnats, mosquitoes and black flies . When BTI is eaten by these larvae toxins are released into their gut which causes the larvae to stop eating. Without food the larvae die. This interrupts the life cycle of these pests and the population then dies off.
BTI is not harmful to humans, birds, fish or mammals. Deemed Fit For Organic production by the USEPA in accordance with the USDA's National Organic Program.
These small round bits containing Bacillus thuringiensis subspecies Israelensis (BTI) can be sprinkled on top of the mix or container. The idea here is to knock out the fungus gnat larvae by introducing BTI into their feeding environment. When you water over the top of the bits, BTI is washed into the mix.