You need to dilute to 50% before putting on carbon.
> hello again. after making mods that were suggested by a group member i
> ran a 3 gal wash through my little still and thumper. i got 750 ml @
> 80% and 950 ml @ 76%. collected 50 ml heads and ran it out to 207 F
> for tails(about a qt). after smelling and tasting i think i will
> combine the hi and low and let them set awhile on carbon then cut 50%
> and oak'em. i read an old post by Mike Nixon that talks about thumpers
> and may try to design my 10 gal along his thinking with the thumper
> thing. anyway sorry rambling but have been storm weary and imbibing
> lol S!