Have to close early this year, mid September in NJ. I forgot last year to add polyquat 60 to pool. It still opened crystal clear. Solid cover and closed mid October then. I’m wondering how important is the addition of polyquat to the process? BTW just a thanks to all that make this site available, 15 yrs struggling to keep my pool clear, 4 yrs with TFP and nary a struggle had. Thanks.