The instructions for running the CYA test indicate waiting 30 seconds after adding the reagent and before running the test. Is there an upper limit on how long you can wait?
I've had some problems getting CYA to register when testing. About ten days ago, I added enough CYA to increase things by 10 ppm. Then, a week ago, I added another 10 ppm. Over the weekend, I added another 10 ppm.
I understand it takes up to a week for CYA to show up properly in the test. However, this AM, I ran a test and expected to see around 20 ppm. I got nothing after waiting close to a minute before testing. I poured the mix back into the dropper bottle to test a second time, but got side-tracked. I don't remember how long I was away, but it was more than two minutes and less than ten minutes. I then poured the mix back into the CYA tube and it was now cloudy and came in about the expected 20 ppm.
Any reason why it might take longer than 30 seconds to start working? Is there any problem with waiting more than 30 seconds, perhaps quite a bit more? Mind you, I wouldn't necessarily expect things to test properly if I let it sit 24 hours, but is there an advantage to waiting a few more minutes?
FWIW, this is a new TF100XL test kit.