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SNS 203 Conc. Pesticide Soil Spray/Drench 4 oz Pouch SNS 203™ kills and repels fungus gnats root aphids thrips shore flies and white flies. How it works: SNS 203™ Concentrated Natural Pesticide active ingredients cause the pests to dehydrate and dry up the ingredients also attack fungus and algae to reduce the food source for the pests.