CSI Water Treatment Systems is a division of Chandler Systems, Inc., founded in 1995, dedicated to improving water quality through the development of water treatment products, design engineering services, and educational programs. They offer solutions for various water problems, including water analysis, product sales, and training for professionals. Their innovative products include ReactR, Signature Series, Nitro, and Sidekick, among others. They also provide a Legacy View Bluetooth App for easier system monitoring and management.