Everything I have read says chlorine should be maintained at 1-4 ppm. However, when looking at the chlorine/cya chart, the target fc column is always higher then 1-4ppm no matter how much cya is in your pool. What's the deal with this?
Right now my cya is at 70 and the chart says I need to target 8-10ppm fc. Is that going to be safe to swim in?