RC has had threads for a while about the better number of the standard I.O. now.
In fact there is a sticky with the figures posted that I.O. mixed to 1.026 generally produced calcium level of around 400, with magnesium level around 1350 and an alkalinity of about 11.
(The sticky is on the Reef Chemistry Forum of RC that lists tested results of many salts, including the new I.O.. See "Synthetic Salt Mixes" sticky)
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