I tested my TA last weekend and noticed that it was at 60. My pH was at 7.5. I thought that I should raise my TA to 70 or 75 so I added the proper amount of baking soda. I added it in 2 days and the amount according to the Pool Math. The last few days, I tested the TA just to see where it was and Thursday it was at 80 and now today it is back to 60. Does it normally fluctuate that amount over the course of the week? Also, my pH did rise to about 7.6 and has stayed there through the different TA jumps. Should I leave it all alone or try to figure out why the TA is jumping so much?