cal·ci·um- noun •Element •Symbol - Ca > 1.) A silvery metallic element that occurs in bone, shells, limestone, and gypsum and forms compounds used to make plaster, quicklime, cement, and metallurgic and electronic materials. 2.) An element in saltwater aquaria that is a required supplement for corals, crustaceous and calcareous marine life in reef tanks most often added in the form of a kalkwasser/limewater solution made from calcium hydroxide.

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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