You are not reading this wrong. I just received my ICP test 2 weeks ago and my alk was 9.3 when I get 8.2 on my hanna consistently for weeks, I tested with Salifert that I used before I got Hanna and Salifert reading was 9.3, so I am going to go with Salifert. I bought a calibration test kit for Hanna and is within specs. Hanna calcium reading was 430 and ICP 630, Salifert calcium was higher than 500, who is wrong ATI or Hanna? Salifert magnesium 1380, ICP 1252, Red Sea Mag test was close to 1200, no go for Salifert Magnesium. Would you trust ICP tests or your own testing??? I got another ICP test by ICP-Analysis.com and get very close to the same readings as ATI.I just recieved my Hanna alk tester, and it's saying 6.2. My salifert, reads at 8...I performed the test with the Hanna Checker twice, and it reads the same each time. Ca is high also at 550, and Monday I performed a 30 gallon water change, on my 120. I went a bit overboard on that one...but typically I only do 15. so I guess I have to dose alk? I have no clue about this, as usually I run high on alk, and now I am so low. I dont have a sump, no doser, it's all by hand. What does anyone recommend? I am still searching through the threads...
Thank You
or...am I reading this wrong?
Salifert for Alkalinity
Salifert for Calcium
Red Sea for Magnesium
This is what I will go with and slowly adjust params and check with ICP in a month.