If chlorine is kept at proper level, is shocking ever necessary?

[Hubjeep]

You need to determine your CYA level, then shock that pool! Keep it at shock level by testing and adding more chlorine 2-3 times daily until the water goes back to cloudy blue. Don't bother with the Ultra Bright--it's a waste of money right now. Just vac'ing the algae out won't completely get rid of it...you have to kill it first. You need chlorine, and lots of it.
Janet

By chlorine do you mean shock powder, granular chlorine dumped directly into the pool, or just load the chlorineator with tabs?

Thanks,
John