New pool owner here...I ordered my tf100 test kit a couple of weeks ago, but have been having trouble building confidence in my ability to measure cya accurately. I wish I had known about the 50ppm cya standard calibration fluid when I ordered, but I didn't, and alas now including shipping, it's a bit pricey.
I have a suspicion that I will have to increase my cya anyway, so I thought that maybe I could buy a jug of stabilizer and create my own 50ppm standard. Is this possible? If so, how can I do it!