I'm guessing that he really has HF or similar beads. As far as I know no one is using pantyhose for HCM beads (the beads are too small and would leak out very quickly).
Also, if you add water directly to HCM beads the heat resulting from the friction of the water racing through the tiny pores in the beads would be notable...
I am not sure of the process for drying HF or similar beads but I am sure that there are a lot of people here who can help.
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I see that he has started another thread asking for help on drying out HF beads.