I have been trying "calibrate" my eyes to read the CYA test so I ordered the R-7065 Sample Solution from TF Test Kits. I went out this morning with my TF-100 and R-7065 to get a photo result of the CYA reading of 50. I added R-7065 to the bottom of the CYA testing bottle label and filled the rest of the testing bottle up to the top of the label with R-0013. I shook the test bottle with red cap for 30 seconds and let it sit for 2 minutes. I then shook it again briefly and set myself up with my back to the morning sun and the CYA view tube at waist height. See below for the photo taken from about the distance of my chin to the view tube at waist height to see the 50 reading on the view tube.
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If this reading is 50ppm then I've been reading my CYA readings too low. The black dot didn't completely disappear for me on the test solution until about 40ppm. Thoughts? Is my testing method off? Do my eyes just need to "calibrate" to this way of seeing the black dot disappear?
A follow up question as well since my CYA result interpretations are likely off - during my SLAM, what should my Combined Chloramines be reading? I'm getting barely .5 for CC and I'm into day 3 of my SLAM, but I've been basing my FC goal off of a CYA of 40. I should probably be aiming for FC of 20 since I'm likely at least 50-60 for my CYA.
View attachment 62628
If this reading is 50ppm then I've been reading my CYA readings too low. The black dot didn't completely disappear for me on the test solution until about 40ppm. Thoughts? Is my testing method off? Do my eyes just need to "calibrate" to this way of seeing the black dot disappear?
A follow up question as well since my CYA result interpretations are likely off - during my SLAM, what should my Combined Chloramines be reading? I'm getting barely .5 for CC and I'm into day 3 of my SLAM, but I've been basing my FC goal off of a CYA of 40. I should probably be aiming for FC of 20 since I'm likely at least 50-60 for my CYA.