cal·car·e·ous - adjective > Composed of or containg calcium carbonate, calcium, or limestone.

Related Resources:

pH Control For Dummies - Saltwater Aquarium pH and Alkalinity Simplified
A simplified explanation about saltwater aquarium fish only and reef tank pH and alkalinity.

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 preapre this calcium solution and add it to reef tanks.

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

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