Help me please!

[Corrinna]

Ok here I am again. Went to two pool stores yesterday with samples of my water. Incredible......both differed from one another and also from my own tests. I am SOOO confused. I understand most of what I read here but if you don't know which test results to go by you don't really have a starting point. The first pool place analizes water with computer based system although I did see her manually enter the CYA value so she must of tested that manually. The second place analizes all of their readings manually with drops. Here are the readings:
CYA 100.............40
TC 1.7................3.0
FC 0.5................0.4
PH 7.4................7.5
TA 180...............160
Adj TA 150..........not done
(first column first store, second column second store)



Thanks again for any comments.
Corrinna