So pool is still under PB's care and they had me take the water to Leslie's for testing. CH tested 120, so they had me add 1/2 bucket of calcium hardness to the skimmer. After the 2nd test it was 140. I decided to test myself with the TF-100 and got 375. So why is Leslie's test so much lower? Did I do anything wrong with my testing? I tested a few more times and was within a drop or two each time before it turned blue.