Low THC does not mean low odour, and a flowering CBD tent smells exactly like any other cannabis tent to a neighbour or a visiting landlord. A carbon filter sized for the extraction fan is the only reliable fix, and it needs replacing roughly once a year. The odour ratings that https://calmcbdseeds.com assigns to each strain helped me pick a milder line for a shared apartment, though even that one needed the filter running through flower. Ozone generators and gels are a waste of money by comparison.