I injured my shoulder getting piles of leaves out of my pool so I have no choice but close early. The water temperature is 67 degrees and the weather is going to be unseasonably warm this week so it will probably be a few more weeks before water temperature drops below 60. I plan on adding some polyquat 60 to the pool the night before the pool service comes to close it since I've got a older mesh cover and I'm closing early. Since there has been a lot of leaves in my pool, I'd like to shock it before I add the polyquat as advised on here, but I'm afraid that the FC will be too high for adding the polyquat if I do this now since the closing is in 3 days . If I shock it now and the FC ends up being too high on Thursday for adding the polyquat, could I lower the chlorine level with some sodium thiosulfate, or could this product cause other issues? If this isn't recommended, should I just skip the pre-closing shock and just keep it at half shock level until we close since combined chlorine is .5 and I don't see any evidence of algae? I'd also like to know if there is anything else I could do to decrease the chances of an algae bloom starting before the water turns colder. My biggest fear is that an algae bloom will start before the water turns colder and we will experience permanent staining as a result. Would it help if I added some more polyquat or liquid chlorine to the pool in a few weeks if the water temperature is still above 60 then?