There are no pucks that are 100%. (I assume you mean chlorine) Some have small amounts of "stuff" (like copper) but all pucks are roughly 2/3 FC and 1/3 CYA.
That said, be aware that the consequences of using ANY kind of puck can lead to problems. I would estimate probably 50% of the folks here with pool water problems is as a direct result of overuse of pucks.
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