Mixing my own Gh builder & trying to work out how much iron & traces to add. If i use the ratio of 3:3:1 Ca:K:Mg and use 3 cups CaSO4, 3 cups K2SO4 & 1 cup MgSO4 or 300g CaSO4, 300g K2SO4 & 100g MgSO4 then how much FeSO4 & CSM+B should i add?
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