Looks like it is dichlor with some other 'stuff' in it, the other stuff being citric acid monohydrate and sodium carbonate. The dichlor is stabilized chlorine (meaning it contains stabilizer or CYA) but I'm not sure how the citric acid monohydrate will react in the water. I'm sure PoolDoc and/or someone much more knowledgeable than I will chime in. When they do, I linked the MSDS sheet below for easy discovery.
Here is the MSDS sheet: http://www.novabella.com/pdf/EvolveBleach_Tabs_MSDS.pdf
Personally, because of the addition of CYA to the water, I wouldn't use it even if the other ingredients make no difference. That is, unless you need added CYA in your pool.
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