You need to check our "Best Guess Table" for the CYA/FC relationship. Normally, when CYA is 100, the maintenance level of FC is 8-15ppm, and, if I remember correctly, shocking level is 25ppm (may be 30).
if CYA is 50, again, from memory, maintenance FC is 3-6ppm and shock level is 15....but check the table.
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