Randy Holmes-Farley
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What about Chloride Ions? Can those get too high if there are no water changes? I have always wondered. Does anybody test for them?
Together, chloride and sulfate comprise nearly all of the negatively charged ions of seawater.
Since the total negative charge is controlled by the salinity, the total of of sulfate plus chloride is essentially controlled by salinity.
Thus, the only the only way chloride can rise is if sulfate falls, and the only way chloride can fall is if sulfate rises.
That certainly can and does happen, for example, if you supplement calcium with only calcium chloride.