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I use a Pyrex measuring cup to add it to the water. Once it’s fully mixed/clear, I check salinity and add more salt or dilute with RODI until it’s 35ppt. Once it’s done mixing and warmed up to tank temp, I recheck salinity. You stated that Red Sea test kits are known to read 100-200ppm high, yet went on to say that my 50/50 mix tested nearly spot on to what was expected, despite the magnesium testing nearly 100ppm lower. That all being said, my tank water tells a different tale. I have been struggling with “chasing Mg numbers” (bad I know) and couldn’t figure out why daily tests kept showing it dropping despite dosing 10ppm daily. I just tested it with the Red Sea test and it’s reading 1500ppm where the Salifert test reads 1190. Sorry, but I’m convinced that the Salifert test is faulty.
Have you used a reference solution to check both mag tests? Not saying Salifert is correct but you’re telling me the Red Sea is reading 1500 when you should be seeing 1300? That’s right on being 200ppm over which has already been documented on here well over a dozen times and I extensively tested during my salt testing
Edit: I see you tested your tank with Red Sea not the makeup water. Excuse the last part