Yes, but if you do put it in the skimmer, you must leave your pump running and not backwash for up to a week. CYA dissolves really slowly (takes up to a week) and if you backwash before then, you'll just throw it out. Also, don't retest for it for a week so you won't accidently get too much in there.
Having said that, before you add it, can you give a current set of water testing results -- everything. Also, how does the water look now?
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