I’ve bought plenty of CN oils (and US oils, too), and I’ve started filtering. But there are so many sins that filter can’t atone for. It’ll pull out some bacteria, but what if BA was never added? That stuff will just grow back after a few uses in a multi-dose vial. What if the API is the wrong one, or at low purity? What about undisclosed EO and guaiacol?How did you waste 150 bucks? If you mean by buying oils from a CN dealer dont worry about it. If youre iffy about them just pass em through a .22 PTFE syringe filter into a fresh vial. You can get everything off amazon. Although id go with a Cobetter filter instead.
Thats what I do and no issues so far.

