I bought this for my Levoit Core Mini's aroma pad. It was an 'acquired taste' at very first, its smell was strong... like pure Pinesol, but after a couple of days or so it became a much sweeter and pleasant woodsy smell.Its so nice that I love whiffing the smell it leaves on my fingers before wash it from my hands.And its lasting really well for me!So far I'm 3 weeks in as of this post, having bought it on January 24th, and despite the small bottle it still has about 1/4th left after having been adding 3-4 drops every 8 hours around the clock. With how much is still left, I'm taking a guess that there is still probably at least a week left- maybe even 2! So yeah, its lasting surprising long.Why around the clock, you might wonder?Now I'm not putting too much faith in these affects, but I've read that Tea Tree essential oil is at least supposed to combat viruses, and with the bugs going around lately, I at least like the thought of it providing even a marginal immunity boost.Maybe it has helped, but again, I wouldn't put too much faith in it.My family have all got a bug, but I haven't yet. It could be my healthy habits, but maybe it might be in the equation though?Anyways, I recommend it if you're looking for an essential oil for an air purifier with an aroma pad.