OK, guys I need hit in the head with a hammer here to help me understand this. I shocked my pool to 12ppm (based on Mikes calculator). When I check it in the morning what test am I doing - is it the Total chlorine test and if so I do I figure out how much extra bleach to add to get back to 12ppm?

Im using a walmart kit and my vial only goes to 5 and its only the TC test.

Cold really use some help here for the morning reading
Thanks
Robert