Was seeing that mercury price was way up from a few years ago too.
Have been thinking about catching the fine stuff that might be available.
The exaust fan over my stove has a very fine expanded metal sandwich to catch grease in the air.
Seams to me the older style filters were copper. If not one could make one that would be after the sluice end with a gap between
the end and a space fot the gravel etc to fall away. Send these in to reclaim the mercury and return to be reused over and over.
If you were already setup for this distilling then you could roll up the filter and stick it in the retourt.
just a thought..
Any way filtering the water would be a feather in two hats.
POP