Yes, you can hang it in an old sock in front of a return jet and squeeze the sock to help it dissolve faster.

(But, for the sake of other people who may be reading this thread, let me clarify ---- if you add the CYA to your skimmer, you should keep your pump running 24/7 for the next four or five days and don't backwash during that time to give the CYA time to dissolve.)