Niki from Akron Ohio writes
GreenClean Pro algaecide is for ponds, lakes, gardens, fountains, ornamental waterfalls, ground surface water, etc not for use in greenhouses nor to kill fungus gnats. We do have the 1300 Orthene TR Micro Total Release insecticide that is labeled for use inside greenhouses and is labeled to treat fungus gnats.
Answer last updated on: 03/24/2015