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Rather than me hijacking a thread, i'll start a new one, maybe Chem Geek could answer this.In laymans terms though please At school we were taught that acids and alkali's were measured on a PH scale.If water at 7.2 is neutral and then by adding chlorine, we turn it acidic.Then what the heck is TA (i assumed Total Alkalinity ??), and how can you affect the PH without affecting the TA?I'm confused.To compound my confusion, i was also under the impression that Chlorine was a bleach, and that bleach was alkaline.How come the stuff we add in the hot tub is acidic.I really should have been more attentive in chemistry.