I have the TF100 test kit and I've run the CH test twice and both times got 540. I don't know if I'm doing something wrong or not.
The first time I used the original chemicals from the kit I got last year. I just received some refills so I used those for the second test.
I took the water to Leslie's because this was so high and I'm not seeing any calcium residue. They're getting a CH of 340 which is more believeable. All their other tests were in line with what I've been getting.
Any ideas why the TF100 is reading so high?