I can't explain the magic glass beads either, I have an FX 4 stage pump, it has the glass beads in the base of the pump, it has them in the secondary filter as it comes out of the base as well , I also run an inline filter with the descicants, charcoal and cotton filters inside it as well, during lockdown I serviced everthing I owned , so I did 2 x HW100 cylinders as well as stripped down the S510 cylinder as well, no water in any of them, also after using the pump, I've whiped the inline filter apart and neither of the cotton pads are wet either inside that, yet when you release the FX drain plug where the first set of magic glass beads are , you can feel the wet air shoot out when you undo it , When you release the valve the air always feels cold , yet when you compress the air it heats up, so maybe the glass beads act as temperature trap as well