I have finally gotten my Taylor 2006 test kit and am in the process slamming my pool because we never get a good FC reading and always have CC. My CYA is about 47 and the pool math app says my shock level is 18. I added the suggest amount of liquid chlorine last night and checked the FC early this morning and the FC reading was back down to 5. My question is did I need to add enough liquid chlorine to reach 18ppm again or just add enough to get it upto 8 or 9ppm?