I am trying to get my Total Alkalinity sorted out on my 30k gal plaster pool. The card that came with my TFP test kit said that my ideal range for TA is 100-120 with an ideal value of 110 for manually chlorinated pools. However, the Pool Math App says that my ideal range is 60-80 with an ideal value if 70. Which is correct? My TA was very low so I raised to 100 based on the card recommendations, but now the app is saying the TA is too high. Which is right?