hi douglas

get yourself 2 or 3 iron core trickle tanks
run them in series, spent fixer as well as wash.
it will transfer iron ions for silver.
let your fingers do the walking through the yellow pages
look under electroplaters/refiners or waste haulers, and you will be
speak to a refiner who will supply you with the tanks, and to find out the best way
to see when the first is FULL, then trade it in, buy a new one
for the end, run them in series again and again.
don't get the other trickle tanks ( the ones that aren't iron core )
if they are not run continuously and are not wet all the time
they channel and don't work and are a waste.

good luck!