I have recently gone into my local pool store with a water sample to compare what I get with my testing vs what they get. Most of the time everything is fairly close except TA. Consistently I get a TA around 100 and they get one around 50 and tell me I need to raise it some. Actually their report says TA(input) of 60 and TA(adjusted) of 48. Based on my 100 I don't need to adjust it. Any ideas on why this might be occurring and which number I should go by? Thanks