The prod. of CO2 also dropped quite noticeaby after a week when I use Fleishmann yeast so I don't really think it's the lack of baking soda. My KH is 6.7 and my Redstar mixture is still running strong after 12 days although I forgot to put baking soda in that bottle.
I'm really not sure though whether different brand of yeast react differently with different tap water condition. So I can't really tell you that Redstar is a better brand.
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