What test kits are you using?
I've been using H2Ocean for a year, and I've found it to be really high in all components - really high in calcium, alk, and magnesium. The last time I tested a fresh batch of H2Ocean I think the alk was somewhere in the 10-11 range, and the pH was definitely above 8. I haven't ever needed to dose magnesium because there's so much of it in the salt.
I'd try testing your water with another test kit before I started adding things to the water
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