About CSI Water

Located in Ashland, Ohio, where it was founded in 1995, CSI Water Treatment Systems is a division of Chandler Systems, Inc., a family of companies with decades of experience bringing new and innovative technologies and products to the water treatment industry.

Our CSI Water team is dedicated to improving water quality through the development of water treatment products, design engineering services and educational programs to provide the utmost in quality and support for our valued customers.

• On September 1, 1995, Bill Chandler formally began CSI Water Treatment Systems, a division of Chandler Systems Inc. As one of the co-founders of Water Soft Inc., Bill brought his experience and innovation to CSI that built one of the most successful water treatment companies in the industry.
• In 1995 CSI introduced its first proprietary product, the ReactR™, an advanced innovation in the treatment of water using a natural aeration process.
• In 2003 the Signature Series™, Chandler Systems' first proprietary control valve, was introduced to the market.
• In 2012 innovation continued as the Signature Series 2™ control valve is introduced.
• Along with the introduction of the new Signature Series 2™ in 2012, the Nitro™ Single Tank Aeration System for iron and sulfur removal was released.
• In 2015 the Sidekick™ Single Tank Aeration Filter with Ozone Complete featuring the Industry’s first single tank aeration filter with the control valve separated from the filter tank is added to our line.
• In 2016 the Legacy View Bluetooth App was released to simplify setup of Chandler Systems Control Valves.
• The Signature 3™ control valve was released in 2018.
• We are driven to constantly innovate with a focus on hard to treat problem water. With the ever-improving line of Signature control valves, industry leading Nitro & Sidekick iron filters and many new products on the horizon, CSI remains dedicated to providing clean, safe water for your residential and commercial needs.