Some free issues are available here
What books should you have in your physical industrial water treatment library? Here are some recommendations.
AWT Technical Reference & Training Manual
Look in the Reference Guide section. There is an e-format as well, with chapters sold separately.
Boiler Water Treatment: Principles and Practice (under the Textbook section)
Cooling Water Treatment: Principles and Practice (under the Textbook section)
Drop by Drop: Articles on Industrial Water Treatment (under the Textbook section)
Reverse Osmosis: A Practical Guide for Industrial Users (under the Textbook section)
Handbook of Industrial Water Treatment (free online)
See more books available at these online bookstores.