I have been using the new TP09 Dyson Purifier Cool Formaldehyde in my living room for about 3 months now. It now has a filter life of 91% but is already blowing out unpleasant rancid smell. It however still indicates that the air quality in my living room within the green zone or the auto target range. I place an open bottle of pure lemongrass essential oil in my house with the intention of killing germs. Is this the cause of the rancid smell? What should I do? Do I need to replace the HEPA filter now?
(Edited by moderator – tags added)
