Water Treatment Best Practices for Cold Storage Facilities

How proper water treatment helps protect refrigeration systems, improve efficiency, and extend equipment life.

Cold storage facilities rely on refrigeration systems to maintain product quality and support daily operations. Whether storing produce, dairy, proteins, pharmaceuticals, or frozen goods, consistent temperature control depends on reliable equipment operating efficiently year-round.

While refrigeration systems receive regular mechanical maintenance, water treatment is often overlooked. Evaporative condensers, cooling towers, glycol systems, and boilers all rely on proper water chemistry to operate efficiently and reliably.

Without an effective water treatment program, scale, corrosion, and biological fouling can gradually reduce system performance, increase energy consumption, shorten equipment life, and contribute to unplanned downtime. A proactive approach helps minimize these risks while supporting long-term system performance.

Key Water Systems in Cold Storage Facilities

Most cold storage facilities rely on several water-based systems, each with its own water treatment requirements.

Evaporative Condensers and Cooling Towers

Many ammonia (NH₃) and HFC refrigeration systems reject heat through evaporative condensers or cooling towers. As water evaporates, dissolved minerals become more concentrated, increasing the potential for scale, corrosion, and biological fouling if water chemistry is not properly managed.

Common challenges include:

• Scale formation: Scale deposits reduce heat transfer efficiency, causing compressors to work harder and increasing energy consumption.
• Corrosion: Corrosion can damage steel and copper components, leading to leaks, repairs, and reduced equipment life.
• Biological fouling: Warm recirculating water can support the growth of Legionella and other microorganisms if not properly controlled, creating operational and regulatory concerns.

Glycol Secondary Loop Systems

Propylene and ethylene glycol systems are commonly used to distribute cooling throughout freezer rooms, refrigerated warehouses, blast freezers, and loading areas.

Although glycol provides freeze protection, it still requires regular monitoring and maintenance. Over time, glycol degrades, and inhibitors become depleted.

Without proper maintenance:

• pH can decrease as glycol oxidizes, increasing the potential for corrosion.
• Low inhibitor levels can allow pitting corrosion to develop on piping and evaporator coils.
• Freeze protection may be reduced if glycol concentration changes over time.
• Biological contamination, while less common, can contribute to fouling and plugged filters.

Regular testing helps ensure glycol systems continue to provide reliable performance.

Boiler and Utility Water Systems

Many cold storage facilities also operate boilers for space heating, defrost systems, or domestic hot water. These systems require their own water treatment program to control hardness, dissolved oxygen, corrosion, and scale.

Managing only one portion of a facility's water systems can leave other critical equipment vulnerable to avoidable problems.

The Impact of Poor Water Treatment

Water-related issues often develop gradually before becoming noticeable during day-to-day operations.

Potential impacts include:

• Higher energy consumption: Scale reduces heat transfer efficiency, requiring refrigeration equipment to work harder and increasing operating costs.
• Equipment repairs and downtime: Corrosion, leaks, or fouled heat exchangers can lead to unexpected maintenance, production interruptions, and costly repairs.
• Regulatory compliance: Cooling towers require proper biological control to help manage the risk of Legionella and support compliance with applicable provincial requirements.
• Reduced equipment life: Industrial refrigeration equipment represents a significant capital investment. Effective water treatment helps protect condensers, heat exchangers, piping, and other critical assets, extending their service life.

What an Effective Water Treatment Program Includes

An effective water treatment program combines routine monitoring, testing, and system optimization. Every facility has different equipment, water quality, and operating conditions, so treatment programs should be tailored accordingly.

Key components typically include:

• Water analysis and system assessment: Evaluating source water quality, existing treatment practices, and overall system condition to develop an appropriate treatment strategy.
• Condenser and cooling tower treatment: Managing scale inhibitors, corrosion inhibitors, and biocides while optimizing cycles of concentration and blowdown to improve efficiency and reduce fouling.
• Glycol testing and maintenance: Regular monitoring of freeze point, pH, inhibitor levels, and microbial activity helps maintain glycol performance and protect equipment.
• Boiler water treatment: Facilities operating boilers benefit from ongoing softening, oxygen scavenging, pH control, and blowdown management to maintain efficient operation.
• Documentation and reporting: Routine testing, service records, and treatment documentation provide valuable information for maintenance planning, inspections, and regulatory compliance.

Supporting Reliable Cold Storage Operations

Reliable refrigeration depends on more than compressors and controls. Proper water treatment plays an important role in protecting condensers, cooling towers, glycol systems, and boilers while helping facilities improve efficiency, reduce maintenance, and extend equipment life.

WMC Water Management Consultants works with cold storage and food distribution facilities across Ontario and Quebec to develop water treatment programs tailored to each facility's equipment, water source, and operating conditions. Through regular monitoring, testing, and system optimization, our team helps facilities maintain reliable performance and protect critical infrastructure.