Six activated carbon powders, SD, BA, TW, ZN, TA and KA, were tested for their ability to clarify, decolor, deodorize and adsorb various yacon juice components. Each activated carbon powder was evaluated at concentrations of 0, l, 2, 3, 4 and 5%. The ZN and TA activated carbon powders, which had the largest bulk volumes of all tested powders, were most effective; producing nearly colorless, transparent and odorless juices at concentrations of 2% to 3% relative to the yacon juice. ZN and TA adsorptiveness of soluble solids and polyphenolic substances was higher than that of the SD, BA, TW and KA powders. Although the absorption of fructooligosaccharides was selectively high, soluble sugars, fructose and glucose, were nearly impervious to adsorption. The adsorption of sucrose was also found to be low.