As if you need another, here's a reminder as to why you shouldn't rely on anyone other than yourself to test your water.
Here are MY results that I confirmed with 2 other (small, independently owned & operated) pool supply stores. The 2 store's results, while not exactly the same as mine, were very close. I use a Taylor kit and all my reagents are no more than several months old.
FC/CC - 28/0 (yes, I know it's high)
Ph - 7.5
TA - 80
CH - 300
CYA - 100
Salt - 4700ppm (also high, I know)
Here are the results that I got from the same sample of water taken at a major pool suppy chain store that services are large community. This is a large and very busy pool supply store.
FC/CC - 1.0/0
Ph - 8.0
TA - 100
CH - 200
CYA - 70
Salt - 4900ppm
So guess what this store tried to sell me? (1) Acid, (2) Calcium Harness increaser (3) Stabilizer, and (4) A new SWG. ALL OF THE ABOVE! I'm almost disgusted to think how many people this business must rip off with all the bad advice / recommendations. Ordinarily, I might say something to them, but this is not the first time I've caught them giving me bad advice and I've already said something to the manager in the past (who was not there today).
And yes, I actually took my sample to 3 different places and all tests were performed within 1 hour of eachother. I wont say the name of the store that gave me these false readings but I will tell you that it's a pretty large chain down in my neck of the woods, has 3 words, and begins with the letter "P"