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I have just read over my own message posted 15 minutes ago. I realise where I have got it wrong. I am confusing the Hardness figure expressed as CaCO3 with the Alkalinity figure expressed as HCO3.
Hardness as CaCO3 - 266.72
Alkalinity as HCO3 - 205
Using Brupaks info, the Alkalinity expressed as CaCO3 is 168.03. Is this the figure to use when I want to adjust the Alkalinity?

[QUOTE="user 6402, post: 1175678, member: 6402"] I have just read over my own message posted 15 minutes ago. I realise where I have got it wrong. I am confusing the Hardness figure [B]expressed as CaCO3[/B] with the Alkalinity figure [B]expressed as HCO3.[/B] Hardness as CaCO3 - 266.72 Alkalinity as HCO3 - 205 Using Brupaks info, the [B]Alkalinity expressed as CaCO3[/B] is 168.03. Is this the figure to use when I want to adjust the Alkalinity? [/QUOTE]

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