I use IO salt and after aerating and mixing with a powerhead for a couple of days the alk of freshly mixed IO saltwater measures about 10-11.
I have trouble maintaining the alk in my tank between 8-9 and I add about 2 teaspoons of Seachem Reef Builder (carbonate alkalinity) daily.
I'm just trying to figure out what is causing your alk to be so high since you are not adding any alk supplements.
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