Aquatic Chemistry 
Now in its updated and expanded Third Edition, Aquatic Chemistry remains the classic resource on the essential concepts of natural water chemistry. Designed for both self-study and classroom use, this book builds a solid foundation in the general principles of natural water chemistry and then proceeds to a thorough treatment of more advanced topics. Key principles are illustrated with a wide range of quantitative models, examples, and problem-solving methods.
Major subjects covered include:
* Chemical Thermodynamics
* Solid-Solution Interface and Kinetics
* Trace Metals
* Acids and Bases
* Kinetics of Redox Processes
* Dissolved Carbon Dioxide
* Photochemical Processes
* Atmosphere-Water Interactions
* Kinetics at the Solid-Water
* Metal Ions in Aqueous Solution Interface
* Precipitation and Dissolution
* Particle-Particle Interaction
* Oxidation and Reduction
* Regulation of the Chemical
* Equilibria and Microbial Mediation Composition of Natural Waters
Reviews
It is fundamental in its approach to the processes that control the composition of natural waters, it is a pleasure to read and should be a must for any student and/or professional in the field.
After more than 20 years working in the field I still find it useful and up to date in many respects.
A pitty that there is no Spanish version of it, thousands of Spanish speaking chemists and geochemists are missing a classic.
The first problem is the often convoluted writing, which lapses at times into incomprehensibility; read this book for 5 minutes and you will find at least one confusing sentence or circular explanation. The second problem is the lack of clarity about how to actually solve equlibrium problems: there are lots of examples of tableaus used to solve problems, but the explanation of how the tableau is constructed is not good, and neither is the description of how to obtain the proton condition or what it is (and it is crucial to understand this). Finally, many so-called "examples" do very little to help clarify things. Readers who find the tableau method confusing as introduced by Stumm and Morgan will find themselves consulting the aquatic chemistry text by Morel (or the later edition by Hering and Morel) to learn how to actually use the method. When they do, they will probably find that text highly preferable: clearly written, with all the examples worked out from start to finish.
These problems really make learning from this text a monumental struggle for students not already versed in the subject. However, as previously noted, as a reference for professionals, it is unequaled.