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I take it you are planning to in increase the dGH with a specific Ca:Mg ratio or the [Ca] and [Mg] at Water Change (WC) when using Reverse Osmosis (RO) water . Many aim for a '3.0 :1.0' 'Ca :Mg' ratio
Just need your RO WC amount and what parameters you are after and one of us will give you the weight of each salt to add to your WC
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