I did what was recommended and drained 50% of my water and added new water. Went and had the water tested today and this is what it says:
Temp - 70; CYA - 36; TC - .4; FC - 0; PH - 7.3; TA - 121; Total hardness - 308. What they recommend is 4lbs of shock. Should I enter this info in the pool calculator and just use bleach or liquid chlorine? How will I know if I need to add more? Thanks a bunch. This site is awesome!