Correlation between alkalinity and specific gravity

[Dinodanger]

If my fresh saltwater mixes at 9.3dkh at 1.026sg what will it be if it’s mixed at 1.025 will there be much difference and if so is there a conversion rate

 

[myinvalidname]

Imagine that pure DI is 0 dkh with a specific gravity of 1.000 ( ignore all temperature dependence). You mix to 1.026 and get a dkh of 9.3, then at 1.025 you should get 9.3 / (1.026 - 1.000) * (1.025 - 1.000) = 8.94

Likewise if you only add half the salt, the the ion concentrations will be half and dkh will be half.

This assumes you stay in a concentration range below saturation for Ca and CO3. And that your using the same salt brand / product, so it’s apples to apples.