Water treatment equipment and chemicals

Our services

Specialist water hygiene equipment and chemical solutions

At Complii, we combine technical expertise with advanced technology to help you maintain safe, compliant, and efficient water systems. Our range of high-quality water hygiene equipment and chemicals is designed to control risk, enhance performance, and simplify ongoing maintenance.

Equipment and chemicals

Water softeners

Our commercial and industrial water softeners are designed to deliver reliable performance in even the most demanding environments. Available in simplex, twin continuous flow, and true duplex high-flow configurations, each system is built for efficiency, resilience, and long service life.

With a wide range of resin capacities and flow rates available, our engineers will help you select and install the right solution to protect your systems, minimise scale build-up, and maintain consistent water quality across your site.

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Equipment and chemicals

Water conditioner

Our water conditioners are designed to improve water quality and extend the life of your equipment by reducing hardness and preventing scale formation. Ideal for areas with high levels of calcium and magnesium, these systems protect pipework, boilers, and appliances from damaging build-up that can affect performance and efficiency.

By treating water at the source, our conditioners help maintain system reliability, lower maintenance costs, and support compliance across your site.

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Equipment and chemicals

Chlorine dioxide

Chlorine dioxide is a proven and versatile solution for water purification and disinfection across a range of environments, from commercial buildings and hospitals to food processing facilities and industrial cooling systems.

At Complii, we provide chlorine dioxide systems to suit every application — from small borehole treatments to fully engineered generation systems for data centres and industrial water processes.

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Equipment and chemicals

Remote monitoring

Our remote monitoring systems give you full visibility of your water network, allowing real-time oversight of temperature trends and potential risks. By providing accurate data and automated alerts, they support proactive maintenance, reduce manual testing, and help you manage budgets more efficiently while maintaining safety and compliance.

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Equipment and chemicals

Filter pots

Our filter pots are designed to meet the demands of commercial and industrial closed system applications, delivering reliable performance and long-term protection. Available in both magnetic and cartridge filtration options, each unit features an innovative, un-blockable design for continuous system flow and easy maintenance.

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Equipment and chemicals

ATI Sitebox

The ATI SiteBox offers a smart, connected approach to monitoring closed water systems. Combining advanced sensors with real-time data capture, it delivers continuous insight into water quality and system performance, helping teams detect issues early and maintain compliance with confidence.

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Your questions answered.

Complii provides a full range of water hygiene solutions, including water softeners, conditioners, chlorine dioxide systems, filter pots, remote monitoring technology, and ATI SiteBox smart monitoring units. Each product is designed to improve water quality, reduce risk, and support long-term compliance.
Water softeners and conditioners prevent the build-up of scale caused by hard water. By removing or altering calcium and magnesium levels, they protect pipework, boilers, and appliances, improving system performance and extending the lifespan of your equipment.
Chlorine dioxide is a powerful disinfectant used for controlling bacteria, biofilm, and odour in water systems. Complii’s chlorine dioxide generators deliver precise proportional dosing for consistent, high-purity treatment, with built-in safety features to protect people and property.
Our remote monitoring systems and clip-on temperature sensors provide real-time data on hot and cold water systems, helping Responsible Persons identify risks such as legionella growth. This proactive approach reduces manual testing, saves time, and ensures issues are addressed before they escalate.
Our filter pots feature an un-blockable design for reliable flow and easy maintenance, while the ATI SiteBox uses smart, integrated technology to deliver continuous water quality insights. Together, these systems enable early detection, informed decision-making, and total confidence in compliance.

Equipment & Chemicals.

Specialist water hygiene equipment and chemical solutions

Water softeners

Water conditioner

Chlorine dioxide

Remote monitoring

Filter pots

ATI Sitebox

Complii strengthens water compliance and mechanical capability across the Midlands and North with the acquisition of GMS Services

Complii strengthens commercial leadership with the appointment of Dan Learmouth as Head of Sales - Lifts and Escalators

Complii acquires The General Lift Company

Compliance with confidence.