I don't think your the only one haveing the issue.I just started to change from RC to Brightwell,I'm finding rc mixing at 13 to 15 dkh depending on the bucket and just discussed this with the LFS and they said people are seeing as high as 18 dkh with both rc and io.We use red sea pro on the wifes tank and it mixes at 9.3 everytime but it's very expensive.She's spoiled I guess.I'm mixing up my first bucket of brightwell as I type this.I will be back when I'm done mixing and testing to share the info.
ok mixed up three buckets now all three test at 11.2 dkh alk and 420 ppm ca,atleast they're consitant at 68 degree's.The buckets are now at 78 degree's alk has now changed to 10.2 dkh and cal is at 415 ppm,as advertised what a surprise??