I'm new at beekeeping, and have only rendered about 10# of wax.  This is
what I did to get pretty good looking wax
 
After melting the wax in the solar melter, I put chunks of it in a 1#
coffee can.  I then added about 2 cups of water to the cold wax.  I placed
the coffee can in a pan of water, and brought the water in the PAN to a
boil.  The water in the coffee can did not boil, but it did get hot enough
to melt all of the wax. When the wax was melted, I poured it thru a window
screen strainer into a plastic bowl.  The screen caught any big chunks of
stuff.  The hot wax floated to the top of the hot water.  I let everything
cool off, then removed the wax and washed it.  I was left with nice clean
wax.
 
Steve
Elyria, Ohio