Definition: 1.) A carbonate or hydroxide of an alkali metal, the aqueous solution of which is basic in reaction. 2.) Any of various soluble mineral salts found in natural water and acid soils. 3.) Alkali metal.
Pronunciation: al·ka·li (noun) • Plural ·lis or ·lies
The oceans of the world are alkaline in nature, having a pH of 7.1 or greater. The normal pH of saltwater in the oceans is about 8.2. Bicarbonate of soda can be added to saltwater which will raise the alkalinity.
Articles About Alkalinity:
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pH Control For Dummies - Saltwater Aquarium pH and Alkalinity
A simplified explanation about saltwater aquarium fish only and reef tank pH and alkalinity.
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Adding Limewater To Reef Tanks - a.k.a. Calcium or Kalkwasser - An Essential Reef Additive
A discussion about what limewater or kalkwasser is and how to mix or prepare this calcium solution and add it to reef tanks.
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Saltwater Aquariums Maintenance Care - About Water Quality and Chemistry.
All about water quality and chemistry issues - what chemical elements to look and test for - calicum - pH - alkalinity - nitrates - phosphates - other testable compounds

