Calcium level in IO salt

[ron101]

I'm guessing that the salt manufacturers have to allow for people mixing their salt with tap or well water (instead of RO/DI) that already contains some amounts of calcium and carbonates. If they didn't do this there would be the potential for CaCO3 precipitating out due to excessive Ca and CO3 and then ruining the SW.

Since most of the water in the GVRD is super soft I think most salt mixes are going to come up somewhat sort in Ca and KH levels.