Two people in protective suits and helmets examine a water treatment site. One points ahead, while the other holds a tablet.

A Legacy of Innovation

CSL Water Quality, Inc. has been at the forefront of commercial and residential water treatment solutions for nearly a century. Founded in 1930 in Newark, New Jersey as Carbon Solvents Laboratories, we started as a manufacturer of solvents, cleaners, and degreasers, including SLATEX, a blackboard cleaner that restored slate surfaces. As our focus shifted toward boiler and heating system maintenance, we developed chemical treatments to improve efficiency and longevity in steam heating systems.

Evolving With Industry Needs

The post-World War II era brought significant changes to fuel sources and water treatment. In 1950, we relocated to Kenilworth, New Jersey, adapting to the shift from fuel oil to natural gas in boiler systems. Our product line expanded to include water treatment chemicals that kept heating systems clean and free from corrosion and deposits.

By the 1970s, CSL Water Quality, Inc. became an integral part of the industry's shift from traditional inhibitors like chromates and phosphates to more sustainable alternatives such as molybdate and multifunctional polymers. We also played a role in the formation of the Association of Water Technologies (AWT), a key organization dedicated to research, education, and certification for water treatment professionals.

A person in protective gear kneels by a water treatment facility, examining a sample bottle. A portable lab kit is open beside them.

Our Commitment

In 1986, we rebranded as CSL Water Treatment, Inc., reflecting our growing focus on water-side treatment solutions. Around this time, our TruTest Division was established, offering certified laboratory services for residential and commercial water quality testing, microbiological analysis, and product quality control.

As our capabilities expanded, TruTest was integrated into the parent company, leading to the name we carry today-CSL Water Quality, Inc. This name represents our adaptability, deep expertise, and continued commitment to providing safe, effective, and compliant water treatment solutions.

Our Mission

CSL Water Quality, Inc. continues to serve industrial, commercial, and residential clients with customized water treatment programs, regulatory compliance support, and advanced chemical solutions. With nearly a century of experience, we remain dedicated to protecting water systems, ensuring energy efficiency, and helping clients navigate evolving industry regulations.

Navigating Water Safety Compliance?

We provide expert guidance on ASHRAE 188-2018 and local legislation. Let's ensure your facility meets all requirements. Contact us for a consultation today.

Multiple pipes discharging clear water in a row against a concrete wall.