calcium hydroxide - noun> A soft white caustic powder, Ca(OH)2, used in making mortar, cements, calcium salts, paints, and petrochemicals. Used in saltwater aquaria to make up kalkwasser/limewater solutions for reef tanks.

Related Resources:

Adding Limewater To A Reef Tank
What limewater (AKA kalkwasser/calcium) is, and how to mix and use it in a reef tank.

Testing Your Aquarium Water
Find out what tests kits you need for a Fish-Only and Reef Tank, frequency of testing, and acceptable ranges on test parameters.

More About Calcium
Information about the relationship between pH and alkalinity and how to measure and control or keep these chemical elements at steady levels.

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