What level of FC does it become unsafe to swim?

Ok thanks. I think I narrowly avoided an algae bloom and was considering another short shock, but I didn't want to keep everyone out for over a week. Is it worth it in this situation to just do a "mini-shock" without going all the way to shock level and holding until passing the ONCLT? Maybe that would be a waste of time and bleach, but I work daylight to dark and that process can be tedious.
 
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