In effect, when one has an appropriate Free Chlorine (FC) level relative to the Cyanuric Acid (CYA) level based on Ben's Best Guess CYA chart, then you are continually oxidizing bather waste and other organics and preventing algae growth with no need to shock the pool (i.e. no need to periodically raise the FC level).

The main reason shocking is needed in non-BBB pool care is that the CYA level climbs and the FC level is too low so that you need to periodically raise the FC level weekly to try and catch up. Eventually, you fall behind anyway and get mysterious chlorine demand or dull/cloudy water or visible green algae. All of this is avoided with BBB by simply maintaining a consistent and appropriate FC/CYA ratio. So simple, yet so effective.

Richard