waterbear-
Thanks for your reply. My TA is kept between 70 and 100. I add about 25 gallons of 12.5 % NaClOH / month and about 20 gallons of HCL / month. 50 lbs of sodium bicarbonate is added about once every 5 weeks. That's all I ever add (except for calcium once in a blue moon) so it seems to me that the net change in pH for my pool when adding NaClO is significantly +