jw2022

Hello there, I am in the process of changing our Sundance Constance hot tub from baqua to chlorine. I have done a safeguard spa flush, drained, replaced filters and just added chlorine to start the super chlorination process. I have read that I need to add enough chlorine to maintain 20ppm for a period of time. One article says 60 minutes, another says 72 hours. Any advice on the timing? Also, the high level of chlorine sent the ph balance through the roof and the total alkalinity to zero. Do I need to adjust these levels now or just let them be since I will be draining the tub after the super chlorination. Thank you so much!!