Thank you for your feedback.
Sorry to hear that the odor of the liver is not as reduced as much as you expected. One thing I would try is to turn the unit to a lower setting during the day to create a longer dwell time so the carbon has longer to remove tougher to get odors.
If you feel the full carbon isn't as strong as the HEPA, you can also try the HEPA with a Carbon insert. This way if the liver odor is adhering to fine particulates, your HEPA would trap it and you'd still have carbon for odors.
Foods can be tricky so balancing is important.
Thank you for your feedback. We always strive for improvement. We also reached out to the manufacturer for further recommendations for your specific situation.