I have a new pool and I've spent a ton of time on this site and follow the recommendations. I have read and understand the Chlorine/CYA chart. My CYA is around 50 and I usually bump my FC to 5 PPM each night and my CC is always 0 when I maintain 5 PPM each night.
There have been times when I've maintained 3 PPM in the evenings. When I do that, FC is usually around 1 or 1.5 the next evening and CC are still 0 or barely registering, so under .5, and once I dose it to 3 PPM, by the next morning CC is zero and the next evening my FC is back down to around 1 or 1.5.
So, my question is, even though the CL/CYA Chart says I should maintain 4-6 PPM of Cl if my CYA is 50, am I okay maintaining 3 PPM if my CC is consistently at 0 or occasionally rises to .5 or less then goes to zero once I add Cl? This is also assuming all my other numbers (Ph, TA, etc) are in line.