Water chemistry can be complicated and confusing. This is a good read to understanding all about water parameters
http://www.reefkeeping.com/issues/2004-05/rhf/index.php
Solving Calcium and Alkalinity Problems
http://www.advancedaquarist.com/issues/nov2002/chem.htm
http://www.reefkeeping.com/issues/2004-05/rhf/index.php
Solving Calcium and Alkalinity Problems
http://www.advancedaquarist.com/issues/nov2002/chem.htm
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