Even more IO salt talk

[Aquattro]

Not sure that the salt has the same problem as the "bad batch". That salt tested very high dKH, around 97 I believe. In your first batch you gave a # of 16 for dKH. I had this also with my salt, but 24 hours later it had gone down to 11 dKH.
Are you using RO water? 420 ppm Ca seems high for IO at 1.024.
I guess to digress a bit further, we should find out what problem your setup is having.