In the standard HAFbio option, the first section of the bed is inoculated with microorganisms for which the odorous gasses are food.
Microorganisms colonised in the filter bed transform odorous compounds into harmlessly odourless chemicals. The entire filtration process through HAFbio is based on gas passing through the successive layers of the beds.
In the high-temperature version, the HaloSorb resin acts as a molecular sieve, absorbing the malignant compounds.