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I occasionally get fungus gnats but rather than get into drenches and sprays i use a little diatomaceous earth; not news to anyone i know. What i do is keep it in a re-sealable salt shaker and lightly apply it to the soil a few hours after watering. The lid keeps it dry and shaker allows me to apply a very light “seasoning” to the soil. If you apply it regularly in light volumes it does not clump and keeps them at bay.