Most larvicides used today are relatively safe to non-targets.
Briquets, pellets, granules and water soluble liquids quickly go down into the water column where most fish and other non-targets exist, having greater impact. MMF is completely water insoluble and remains only at the water surface, affecting only a few surface dwellers. While other products quickly settle to the bottom, MMF remains at the water surface. Midges can be either a concern or a target. Almost all larvicides used have an effect on midges.