I have been studying pool school and pool math recently and see a small difference when it comes to chlorine levels and CYA. Perhaps I am just splitting atoms here.
At 50ppm of CYA the Chlorine / CYA chart recommends FC at 4-6ppm whereas poolmath suggests FC 4-8ppm when setup as TroubleFreePool.com. However shock levels are consistent between the two. Which of the two should I use as my goal? Sorry if this subject has been covered previously.