Sure. There are Cal-Hypo based tablets, that add calcium rather than CYA. Unfortunately they tend to dissolve rather quickly and turn to mush, unless you get the type in a plastic capsule. And you MUST NOT put them in the same feeder as Tri-chlor tabs (the ones that add CYA).
But they are, IMHO, a really lousy alternative to Tri-Chlor tabs.
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