The Radial scrubber is the older scrubber in design. Radial
scrubbers are most times used in two hose breathing and pendulum breathing loops, sometimes even
with split counter lungs. There is a very old discussion on the efficiency
of this scrubber type versus axial models. Only very complex tests show
that the quantity of scrubber material, flow, form of the housing and many
other factors determine the quality of a scrubber. Axial or Radial is not a
general recipe for a good or bad scrubber.