My store gets a TA of 99; I get 120 with my Taylor kit. Here is what I found most interesting though. With a store TA reading of 99, they want me to add 10 lbs. of sodium bicarbonate to raise the level. I looked at the bag of what they want me to add and calculated that it would bring the TA to 149. Why so high? If indeed my test kit is off and their reading of 99 is accurate, isn't that number still in a satisfactory range? My store always lists 125-150 as being the desired range of TA. Why would you want to bring the TA to the top of the suggested range? My thinking is that, if my TA is at 120 - which is what I get - it surely doesn't need to go any higher. If anything, with the new plaster and constantly having to add pH decreaser, I'm trying to keep the TA down.
Should I plan on going with the results I get or what the store gets? I've been following their advice for 25 years but never had a good test kit before to compare results.
Thanks for any input.