Randy Holmes-Farley
Reef Chemist
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Dear Dr. Randy,
When we talk about alkalinity in a reef tank, is it Alkalinity (M), Alkalinity (P) or Alkalinity (Total)?
Best,
Rabih
With a few exceptions, we are measuring and talking about total alkalinity. In normal seawater, carbonate alkalinity and total alkalinity are quite close, with the small amount of borate alkalinity making up the reminder.
This article has more detail:
http://www.advancedaquarist.com/2002/2/chemistry