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Easy math, 1% equals 10 ML per liter (1000 ML). I use neem oil or Bionide pyrethrin at that rate. I think 1% may be good rate for other oils as well. I’ve been struggling with fungus gnats lately because I have a lot of other houseplants. I recently implemented bottom watering, I thought DUH!!!, I was completely overlooking cultural practices as IPM. Peace