Visible algae

It can take time. The biggest thing that could be an issue right now is hidden places for algae to hide that aren’t getting the high chlorine dose.
 
update. Still working on slam as I continue to get what appears to be dead algae in bottom of the pool. it looks like dirt but I grabbed some on pool steps and it gets disappears. I guess I’ll continue the process but do have one question. There are 4 or 5 very small spots on bottom of pool that will not vacuum up or brush off. Could this be algae stuck in crevices in pool? If so any thoughts on how to get it off?
 
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