Granules are the most cost effective by far. Read the link about using a sock in your skimmer basket. Make sure your filter is relatively clean before you put the CYA in. You don't want to have to clean it till after you know your CYA is fully dissolved. Give it a week to be safe, even though the sock will be empty well before that.
Squeezing the sock occasionally while it's dissolving will speed things along.
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