I bought a TF-100 full kit in the middle of pool season last year (mid-July). I have plenty of each chemical left over, and was wondering if there is any reason to believe that any of the chemicals have lost their effectiveness over the past 8 months? Are any of the chemicals more likely to degrade than others? Pool season is still a couple months away, but I am trying to determine if I should buy a fresh refill kit. Thanks!