Question: how many drops of essential oil in 100ml diffuser?
Answer: Most ultrasonic diffusers hold 100mL of water. Ideally, most people recommend between three and five drops of essential oil for every 100mL of water. Also, your amount will depend on the size of your diffuser and where you have it in your home. You can get different size diffusers, but most of them go up by 100mL.