Florida Penguin said:2) It sounds like JasonLion was responding to both my issue and dschlic1's issues. From my perspective, I feel pretty confident I got all the areas that could have alge during my 3 days of supershock (FC>=30). There was a small area (< 3 sq inches) on the pool cover that had some alge on it, but that is a non-isssue at this time since I put the cover away for the summer.
I think what JasonLion was referring to are areas with low circulation of water, like corners, pool steps etc. If there is an area with low circulation of water you will not get 30ppm in that particular area as the chlorine simply won't get there, hence the algae will be still growing in those hiding spots.