CYA dissolves very slowly. I wouldn't put it in a DE filter, maybe it's OK but those grids look pretty fragile to me. You can put in in an old sock and hang that in front of a return. It'll take a few days to a week to dissolve completely.
Borax is one of the only chems you can safely add with others - but to be safe it's usually a bad idea to let dry chems touch each other. It will dissolve much more quickly than CYA as long as you prevent it from clumping - if it forms rocks they take a while to dissolve.
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