You need to keep the pool at 10 ppm of chlorine until 1)the water is clear, 2) the CC is zero, AND 3) you don't lose any chlorine when testing at sundown and again at sunup. Then you can let it drift back down to the 1-3 range.

How long this process takes depends on how consistent you are about maintaining that 10 ppm--the more frequently you test and add more to get back up to 10, the faster the pool will clear.

Keep an eye on your filter pressure and have the filter running 24/7 during this process--you may find that you have to clean the filter more often as the dead algae is removed.

Janet