Hello. We have a newly installed pool. 26.5K gallon liner pool and I have been working on getting the chemicals right. The past two times I have taken the water to be tested, the salt is low compared to the reading on the display. 1st time - 2640 test, 2850 display, 2nd time - 3110 test, 3600 display. The display is now showing 3600 and instant was the same. I did the reset and it calibrated both to 3500. I plan on taking the water to be tested again Thursday. I'm new to pool chemistry and these electronic systems. Is this normal for the display readings to be high? Also, I checked to make sure that the display showed the correct T-15 cell. Any help would be appreciated. Thank you.