That compact round-cake arrangement on a horizontal tube is very prone to clogg, and needs frequent manual attension!
It has been built by Fredrik Ek as a twin version integrated in his trailer frame; he neglected to add a bottom half-diameter-tube (really 2/3 diameter) for soot collection under the filter cylinders, and it needs a lot of attension.
In the winter, condense water froze the soot and filter on the bottom half!
For short, a miserable construction without providing what the circumstances need!
Nowadays, the filtercyliders are just settlement tubes before the cooler.
After the cooler, he uses a chest with wet (damp) open-cell matress sheets followed by hot reheating for a truck-size paperfilter. Gets excellent cleaned and DRY gas!