Split by moderator from HERE. jblizzle
im struggling! I used the above instructions. filled the hot tub, added calcium to get the hardness to 130, then added borax and acid to get borate level to 50. next added baking sode to get the TA to 130 (based on pool calculator), then added acid added to get the pH right. then "shocked" with chlorine to 10 ppm. though everything was great, but rechecked and TA was down to 40 due to amount of acid i had to use to get the pH right. just added more baking soda (only half the amount to get the TA back up) and the pH is is back over 8. what am i doing wrong, it doesnt seem like i can get to a TA of 130 AND have a pH of 7.5. . . . please help!