This is an accumulation of reef chemistry articles mostly written by Randy Holmes-Farley
Handy Calculators (I don't claim to have written these, but they are very useful)
Reef chemicals calculator
http://home.comcast.net/~jdieck1/chem_calc3.html
Calcium Reactor setup calculator (CaCO3/CO2 reactors)
http://home.comcast.net/~jdieck1/reactor.html
General Articles
Reef Aquarium Water Parameters
http://www.reefkeeping.com/issues/2004-05/rhf/index.htm
What is seawater
http://reefkeeping.com/issues/2005-11/rhf/index.php
Solving Common Problems
Solving Calcium and Alkalinity Problems
http://web.archive.org/web/200211270...v2002/chem.htm
Low pH: Causes and Cures
http://reefkeeping.com/issues/2004-09/rhf/index.htm
High pH: Causes and Cures
http://reefkeeping.com/issues/2005-03/rhf/index.htm
How to Select a Calcium and Alkalinity Supplementation Scheme
http://www.advancedaquarist.com/issues/feb2003/chem.htm
Phosphate and the Reef Aquarium
http://reefkeeping.com/issues/2006-09/rhf/index.php
Nitrate in the Reef Aquarium
http://www.advancedaquarist.com/issu...t2003/chem.htm
The "How To" Guide to Reef Aquarium Chemistry for Beginners
The “How To†Guide to Reef Aquarium Chemistry for Beginners, Part 1: The Salt Water Itself
http://reefkeeping.com/issues/2007-03/rhf/index.php
The “How To†Guide to Reef Aquarium Chemistry for Beginners, Part 2: What Chemicals Must be Supplemented
http://reefkeeping.com/issues/2007-04/rhf/index.php
The "How To" Guide to Reef Aquarium Chemistry for Beginners, Part 3: pH
http://reefkeeping.com/issues/2007-05/rhf/index.php
The “How To†Guide to Reef Aquarium Chemistry for Beginners,
Part 4: What Chemicals May Detrimentally Accumulate
http://reefkeeping.com/issues/2007-09/rhf/index.php
Calcium and Alkalinity
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH
http://reefkeeping.com/issues/2006-06/rhf/index.php
When Do Calcium and Alkalinity Demand Not Exactly Balance?
http://reefkeeping.com/issues/2004-12/rhf/index.htm
An Improved Do-it-Yourself Two-Part Calcium and Alkalinity Supplement System
http://reefkeeping.com/issues/2006-02/rhf/index.php
A Homemade Two-Part Calcium and Alkalinity Additive System
http://www.advancedaquarist.com/issu...l2004/chem.htm
Solving Calcium and Alkalinity Problems
http://www.advancedaquarist.com/issues/nov2002/chem.htm
How to Select a Calcium and Alkalinity Supplementation Scheme
http://www.advancedaquarist.com/issues/feb2003/chem.htm
Electronic Calcium Monitoring
http://reefkeeping.com/issues/2005-04/rhf/index.htm
Purity of Calcium Chloride
http://www.advancedaquarist.com/issues/mar2004/chem.htm
Calcium and Alkalinity Balance Issues
http://reefkeeping.com/issues/2002-0...ture/index.htm
Calcium Carbonate as a Supplement (Aragamight; Liquid Reactor)
http://www.advancedaquarist.com/issu...y2002/chem.htm
The Relationship Between Alkalinity and pH.
http://www.advancedaquarist.com/issues/may2002/chem.htm
The Chemical & Biochemical Mechanisms of Calcification in Corals
http://www.advancedaquarist.com/issues/apr2002/chem.htm
Calcium
http://www.advancedaquarist.com/2002/3/chemistry
What is Alkalinity
http://www.advancedaquarist.com/2002/2/chemistry
Alkalinity Conversion Table
http://reefcentral.com/gallery/data/...5Alk_Chart.jpg
Salinity
Refractometers and Salinity Measurement
http://reefkeeping.com/issues/2006-12/rhf/index.php
Temperature Corrections for Hydrometers
http://reefkeeping.com/issues/2004-07/rhf/index.htm
Reef Aquarium Salinity: Homemade Calibration Standards
http://reefkeeping.com/issues/2004-06/rhf/index.htm
Specific Gravity Measurement
http://www.advancedaquarist.com/2002/1/chemistry
Using Conductivity to Measure Salinity
http://www.aquariumfish.com/aquarium....aspx?aid=1804
Reef Aquarium Water Parameters (a summary general article)
http://www.reefkeeping.com/issues/2004-05/rhf/index.htm
What is TDS?
http://www.reefkeeping.com/issues/20...ture/index.htm
Iron
First Iron Article: Macroalgae and Dosing Recommendations
http://www.advancedaquarist.com/issues/aug2002/chem.htm
Second Iron Article: Iron: A Look at Organisms Other than Macroalgae
http://www.advancedaquarist.com/issues/oct2002/chem.htm
Iodine
Iodine in Marine Aquaria: Part I
http://www.advancedaquarist.com/issues/mar2003/chem.htm
Iodine in Reef Tanks 2: Effects on Macroalgae Growth
http://www.advancedaquarist.com/issu...l2003/chem.htm
Magnesium and Strontium
Do-It-Yourself Magnesium Supplements for the Reef Aquarium
http://reefkeeping.com/issues/2006-07/rhf/index.php
Strontium and the Reef Aquarium
http://www.advancedaquarist.com/issues/nov2003/chem.htm
Magnesium in Reef Aquaria
http://www.advancedaquarist.com/issues/oct2003/chem.htm
Magnesium and Strontium in Limewater
http://www.advancedaquarist.com/issues/dec2003/chem.htm
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH
http://reefkeeping.com/issues/2006-06/rhf/index.php
Handy Calculators (I don't claim to have written these, but they are very useful)
Reef chemicals calculator
http://home.comcast.net/~jdieck1/chem_calc3.html
Calcium Reactor setup calculator (CaCO3/CO2 reactors)
http://home.comcast.net/~jdieck1/reactor.html
General Articles
Reef Aquarium Water Parameters
http://www.reefkeeping.com/issues/2004-05/rhf/index.htm
What is seawater
http://reefkeeping.com/issues/2005-11/rhf/index.php
Solving Common Problems
Solving Calcium and Alkalinity Problems
http://web.archive.org/web/200211270...v2002/chem.htm
Low pH: Causes and Cures
http://reefkeeping.com/issues/2004-09/rhf/index.htm
High pH: Causes and Cures
http://reefkeeping.com/issues/2005-03/rhf/index.htm
How to Select a Calcium and Alkalinity Supplementation Scheme
http://www.advancedaquarist.com/issues/feb2003/chem.htm
Phosphate and the Reef Aquarium
http://reefkeeping.com/issues/2006-09/rhf/index.php
Nitrate in the Reef Aquarium
http://www.advancedaquarist.com/issu...t2003/chem.htm
The "How To" Guide to Reef Aquarium Chemistry for Beginners
The “How To†Guide to Reef Aquarium Chemistry for Beginners, Part 1: The Salt Water Itself
http://reefkeeping.com/issues/2007-03/rhf/index.php
The “How To†Guide to Reef Aquarium Chemistry for Beginners, Part 2: What Chemicals Must be Supplemented
http://reefkeeping.com/issues/2007-04/rhf/index.php
The "How To" Guide to Reef Aquarium Chemistry for Beginners, Part 3: pH
http://reefkeeping.com/issues/2007-05/rhf/index.php
The “How To†Guide to Reef Aquarium Chemistry for Beginners,
Part 4: What Chemicals May Detrimentally Accumulate
http://reefkeeping.com/issues/2007-09/rhf/index.php
Calcium and Alkalinity
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH
http://reefkeeping.com/issues/2006-06/rhf/index.php
When Do Calcium and Alkalinity Demand Not Exactly Balance?
http://reefkeeping.com/issues/2004-12/rhf/index.htm
An Improved Do-it-Yourself Two-Part Calcium and Alkalinity Supplement System
http://reefkeeping.com/issues/2006-02/rhf/index.php
A Homemade Two-Part Calcium and Alkalinity Additive System
http://www.advancedaquarist.com/issu...l2004/chem.htm
Solving Calcium and Alkalinity Problems
http://www.advancedaquarist.com/issues/nov2002/chem.htm
How to Select a Calcium and Alkalinity Supplementation Scheme
http://www.advancedaquarist.com/issues/feb2003/chem.htm
Electronic Calcium Monitoring
http://reefkeeping.com/issues/2005-04/rhf/index.htm
Purity of Calcium Chloride
http://www.advancedaquarist.com/issues/mar2004/chem.htm
Calcium and Alkalinity Balance Issues
http://reefkeeping.com/issues/2002-0...ture/index.htm
Calcium Carbonate as a Supplement (Aragamight; Liquid Reactor)
http://www.advancedaquarist.com/issu...y2002/chem.htm
The Relationship Between Alkalinity and pH.
http://www.advancedaquarist.com/issues/may2002/chem.htm
The Chemical & Biochemical Mechanisms of Calcification in Corals
http://www.advancedaquarist.com/issues/apr2002/chem.htm
Calcium
http://www.advancedaquarist.com/2002/3/chemistry
What is Alkalinity
http://www.advancedaquarist.com/2002/2/chemistry
Alkalinity Conversion Table
http://reefcentral.com/gallery/data/...5Alk_Chart.jpg
Salinity
Refractometers and Salinity Measurement
http://reefkeeping.com/issues/2006-12/rhf/index.php
Temperature Corrections for Hydrometers
http://reefkeeping.com/issues/2004-07/rhf/index.htm
Reef Aquarium Salinity: Homemade Calibration Standards
http://reefkeeping.com/issues/2004-06/rhf/index.htm
Specific Gravity Measurement
http://www.advancedaquarist.com/2002/1/chemistry
Using Conductivity to Measure Salinity
http://www.aquariumfish.com/aquarium....aspx?aid=1804
Reef Aquarium Water Parameters (a summary general article)
http://www.reefkeeping.com/issues/2004-05/rhf/index.htm
What is TDS?
http://www.reefkeeping.com/issues/20...ture/index.htm
Iron
First Iron Article: Macroalgae and Dosing Recommendations
http://www.advancedaquarist.com/issues/aug2002/chem.htm
Second Iron Article: Iron: A Look at Organisms Other than Macroalgae
http://www.advancedaquarist.com/issues/oct2002/chem.htm
Iodine
Iodine in Marine Aquaria: Part I
http://www.advancedaquarist.com/issues/mar2003/chem.htm
Iodine in Reef Tanks 2: Effects on Macroalgae Growth
http://www.advancedaquarist.com/issu...l2003/chem.htm
Magnesium and Strontium
Do-It-Yourself Magnesium Supplements for the Reef Aquarium
http://reefkeeping.com/issues/2006-07/rhf/index.php
Strontium and the Reef Aquarium
http://www.advancedaquarist.com/issues/nov2003/chem.htm
Magnesium in Reef Aquaria
http://www.advancedaquarist.com/issues/oct2003/chem.htm
Magnesium and Strontium in Limewater
http://www.advancedaquarist.com/issues/dec2003/chem.htm
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH
http://reefkeeping.com/issues/2006-06/rhf/index.php