Domino's uses bone in their bleaching process. Many other companies use bone too. Other bleaching processes are used as well to remove the color from granulated (white) sugar.
Though carbonated filters may contain the same chemicals that are also found in liquid bleach, I do not see where the article stated that "bleach" was used in the bleaching process. It said "will bleach the sugar to remove the molasses".
Bleaching is a process. The sun can "bleach" something, like a seashell, white.
"Just Do It"