So my PB is coming out to close us up for our free closing and they say to add my winterizing kit one day before they come to close. I assume this is the bio guard kit since that is all they push in the store. It’s arctic blue (read copper?) algaecide and what looks like trichlor. I assume just raising up to slam levels will be satisfactory correct? I am in MN so the water will be cold when I add the chlorine and it was under 60 when I opened it this year. I assume I should be good to go? Anything else I should be aware of? Thanks for a great first season!