Wow so much information!! Thank you :) I don't have kids and pets so I'm goo there. What is MLM actually? And is there a difference between "ultrasonic" and other diffusers, like these for instance https://www.amazon.com/URPOWER-OD-501-Aromatherapy-Essential-Humidifier/dp/B0118QC1BA?ref_=fsclp_pl_dp_1?