That chart is what sent us to the grocery store for Clorox. But according to the "pool store", I don't want to swim in TC of 10. I assume that with the Cyanuric acid level as high as it is, if I keep chlorine as high as the chart suggests, I can still swim or you would be suggesting the drain immediately.

Also, why the wild shift in Alkalinity in a two week period? I only got a C in college chem, but the husband is a chem major. He'll understand the explanation. Thanks for your help. What did people do before the internet?