Following the recommendations through Simple Pool app (and elsewhere) for my CYA of about 42, I need a minimum FC of 3, target of 5, and max of 7. I test FC daily or every other day.
It is my understanding that I never want to get below FC of 3.0, or run the risk of algae to start growing. Over the last month, I have dropped as low as 2.5 twice.
Is it best to try to maintain 5.0 with daily bleach addition, or is it ok to increase to 5 (or 7), and don't add until it reaches 3 or 3.5? At higher FC levels, I think I remember reading that the FC drop is greater, but I cannot find evidence of this statement right now.