The fact that your FC won't go up and stay up even when you add lots of bleach is an indicator that you are still oxodizing what's left of the algae. It's one thing to kill it and get rid of the green. It's another thing altogether to oxodized the organics that are left behind. As watermom says, keep adding and keep adding until the FC goes up to 15. A good indicator that you're almost done is when you bring it to 15 late one day ( after sun is off the pool) and it is still nearly 15 the next morning. This means the chlorine is not being consumed any more and the organics have pretty much be oxodized. The hold it there for a couple days, brush the pool to expose any remaining algae, then let it drift down to you maintenance level which should be around 3 to 6 ppm FC.
I have had my pool go milky cloudy when I shocked. This, I think is a reaction to calcium when you shock. It will ( should ?? ) filter out and go away on its own when the process of getting rid of the algae is done.
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