I don't have any good data on how much CYA the sticks add, but I don't think it's all that much. I use 2 Bioguard sticks at a time and also add about 1.5 liters of bleach every other day to my ~33,000 gal pool to maintain 3-5 ppm of chlorine. I have done this all summer and my CYA has only gone up from a little less than 30 in May to about 40. So while the Bioguard sticks (and shock) do add CYA, I don't think it adds that much. So it may take you several months to get to your CYA target.
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