In article <2464a$4485ebef$438c8034$9639@xxxxxxxxxx>, Jamesthompson2002
> I came up with probably an old scheme but simple enough to circulate etchant
> in a pcb tank.
> Start with a plastic soda cap, snip the edges of it to make fins. Then use
> silicone sealant to glue a small magnet inside the cap. Cap sits on bottom
> of tank, then.
> Affix another magnet to the shaft of a small dc motor mounted in a standoff
> base for your tank and directly under the cap. As motor spins, so does cap
> and etching solution. Simple enough you think?
I used an aquarium air pump and a bubble wand to keep things moving back
in the day.