> Add 1 part per million (ppm) copper sulphate while there is still some
> yeast activity. Any excess copper will be chelated by the yeast, and you
> will clean up a lot of the pong. Leave on gross lees until dry, then rack.

I don't see a need for this if there are no off smells, stirring the
lees is a safer option in my opinion. I would not mess with copper
sulphate unless I had to personally.

Joe