Bought a new test kit pool looks good but been fighting PH all summer was using test strip so thought I'dtry kit I show 6.5 and TA 170 with kit. I took sample to local pool store to see what's up they said PH was 6.5 but TA low at 69 the said raise TA so spent money to do what they said thinking there computer system would be more accurate. But why such a swing in mine and theirs. What do I do going forward