Quote Originally Posted by ranand View Post
Janet

Would the shock amount add that much more CYA? Would that be about 12 oz for 3lbs of shock or less than 10 ppm. .
Ranand,

If this poster were using the dichlor to maintain a shock level of 20 ppm for a few days, as would be required to kill off an algae bloom, his/her CYA would skyrocket. Dichlor gives 9 ppm of CYA for every 10 ppm of chlorine delivered. Dichlor would be a bad idea for this poster's issue.