Types of Water Treatment Chemicals: Uses, Applications and How to Choose

Water treatment chemicals are used in many industrial, commercial and marine systems to control problems that can affect water quality, equipment condition and system performance. Depending on the application, treatment may be required to control corrosion, scale, deposits, microbiological growth, sludge or other water-related problems.

There is no single chemical that is suitable for every water treatment application. Boiler systems, engine cooling systems, closed-loop circuits, potable water systems and other water-handling equipment can require different treatment programs based on the water chemistry, equipment design and operating conditions.

Understanding the types of water treatment chemicals available can therefore help facility managers, maintenance teams, marine engineers and industrial buyers identify the type of treatment required before selecting a product.

In this guide, we explain the main categories of water treatment chemicals, what they are used for and some of the water treatment products available through Morven Industrial in Nigeria.

What Are Water Treatment Chemicals?

Water treatment chemicals are substances used to control specific chemical, physical or biological conditions in a water system. Their purpose depends on the application. Some products help control corrosion, while others address scale, sludge, hardness, microorganisms or other problems.

Industrial water treatment programs are normally designed around the characteristics of the water and the equipment being protected. For example, a boiler water treatment program can be different from the treatment required for a closed engine cooling-water system.

Nalco Water identifies corrosion, scaling, fouling and biological contamination as common problems affecting industrial cooling-water systems. Its boiler-water information also identifies scale and corrosion as key issues that treatment programs are designed to address.

This is why water treatment should be approached as a system-specific requirement rather than simply selecting a chemical because it is labelled as a water treatment product.

1. Corrosion Inhibitors

Corrosion inhibitors are used to reduce the corrosive effect of water on metal surfaces in suitable water systems. They can be formulated for different operating conditions and different metals.

Corrosion can affect pipes, heat exchangers, engines, boilers, cooling systems and other equipment. If left uncontrolled, it can contribute to material loss, leaks, maintenance requirements and equipment damage.

Morven Industrial supplies products such as NALFLEET Cooltreat AL, an organic liquid corrosion inhibitor intended for closed engine cooling-water treatment. The product is designed to protect common metals found in cooling-water systems, including aluminium.

Another product is NALFLEET Engine Water Treatment 9-108, a corrosion-inhibitor treatment designed for diesel-engine cooling-water systems. Its product information also identifies an antiscalant and a formulation intended to protect metals commonly found in engine cooling systems.

2. Scale Inhibitors and Hardness Treatments

Scale develops when dissolved minerals in water precipitate and form deposits on surfaces. In heat-transfer equipment, excessive scale can interfere with heat transfer and increase maintenance requirements.

Scale control products are therefore an important part of some boiler, cooling-water and other industrial water treatment programs.

NALFLEET Hardness Treatment 7208 is listed by Morven as a liquid treatment containing alkaline and phosphate components. It is used to help prevent scale in both high- and low-pressure boilers and can form part of coordinated or alkaline phosphate boiler treatment programs.

Choosing a scale-control treatment requires consideration of the water hardness, temperature, equipment design and treatment program already in place.

3. Boiler Water Treatment Chemicals

Boilers require carefully controlled water chemistry because scale, corrosion and sludge can affect the boiler and steam system. Treatment programs may involve several chemical functions rather than one product.

These can include treatments for hardness, corrosion, oxygen control, sludge conditioning and condensate protection, depending on the boiler and operating conditions.

NALFLEET Boiler Coagulant is a liquid sludge conditioner listed for boiler-water applications. It helps keep sludge in a form that can be removed through normal blowdown and can be used alongside regular boiler water treatment chemicals.

Morven also lists NALFLEET Condensate Control, a combination of liquid-neutralizing amines intended to help control corrosion in steam and condensate systems.

Boiler treatment should always be based on the boiler design, feedwater quality, operating conditions and the manufacturer’s treatment instructions.

4. Cooling Water Treatment Chemicals

Cooling-water systems can experience corrosion, scale, fouling and microbiological contamination. These problems can affect heat transfer and equipment reliability if they are not properly managed.

Industrial cooling-water treatment programs can use different chemical functions depending on whether the system is open or closed, the metals involved, water chemistry and the specific operating conditions.

NALFLEET Cooltreat AL is designed for closed engine cooling-water treatment and is listed for applications including diesel engine cooling systems, compressor cooling systems, centralised cooling systems and auxiliary machinery cooling.

Morven’s catalogue also includes NALFLEET Brine Corrosion Inhibitor, intended for closed recirculating cooling systems using chloride brine.

The correct treatment should be selected based on the cooling system, water chemistry, equipment materials and treatment objectives.

5. Oxygen Scavengers

Dissolved oxygen can contribute to corrosion in boiler and steam systems. Oxygen-scavenging chemicals are therefore used in some boiler-water treatment programs to reduce the amount of dissolved oxygen available to react with metal surfaces.

Morven’s water-treatment catalogue includes products designed for boiler and steam-system applications where oxygen control forms part of the treatment program.

For example, Drewplex OX is an all-volatile liquid corrosion inhibitor for low-, medium- and high-pressure steam-producing systems. Its product description identifies DEHA as the oxygen scavenger used in the formulation and lists applications involving feedwater, boilers, steam and condensate lines.

The appropriate oxygen-control treatment depends on the boiler and steam-system requirements, so product instructions and treatment specifications should always be followed.

6. Sludge Conditioners and Dispersants

Sludge and suspended deposits can accumulate in boilers and other water systems. A sludge conditioner can help maintain deposits in a form that can be removed through the system’s normal cleaning or blowdown process.

NALFLEET Boiler Coagulant is one example. Morven describes it as a liquid sludge conditioner that helps prevent sludge from building up inside boilers and keeps sludge particles suitable for removal through standard blowdown.

In a boiler treatment program, sludge conditioning is normally considered alongside other treatment measures such as hardness control, corrosion control and monitoring.

7. Potable Water Treatment and Stabilizers

Water intended for potable use requires a different treatment approach from industrial process water. The treatment chemical must be suitable for the intended water system and used according to its approved application and dosage instructions.

Morven lists Potable Water Stabilizer, a concentrated soluble polyphosphate product intended for scale and corrosion control in shipboard once-through and potable-water systems.

The product information specifies dosage ranges and states that the powder should first be made into a water solution before administration. This illustrates why dosage and application instructions should not be estimated or copied from another water treatment system.

For drinking-water applications, buyers should confirm that the specific product is appropriate for the intended use and follow the relevant product documentation and local requirements.

8. Biocides and Microbiological Control

Microorganisms can create problems in some water systems, particularly where conditions support biological growth and biofouling. Microbiological control products may therefore form part of selected industrial or marine water treatment programs.

Morven’s Unitor range includes NALFLEET Bioguard Plus, described as an anti-foulant and corrosion inhibitor for seawater systems. The product is intended to address biological fouling organisms that can interfere with seawater cooling systems.

Biocides and antifouling treatments require careful handling and application because their suitability depends on the water system, target organisms, dosage and discharge requirements.

How to Choose the Right Water Treatment Chemical

The correct water treatment chemical should be selected based on the system and the specific problem that needs to be controlled. Before ordering a product, consider the following:

• Identify the water system: Determine whether it is a boiler, cooling system, potable-water system, closed loop, process-water system or marine application.
• Identify the problem: Establish whether the main issue is corrosion, scale, hardness, sludge, oxygen, biological growth or another water-quality problem.
• Check the water chemistry: Parameters such as hardness, pH, alkalinity, chloride and other characteristics can affect treatment selection.
• Consider the equipment: Identify the metals, temperatures, pressures, flow conditions and components exposed to the treated water.
• Review existing treatment: Avoid adding a new chemical without considering the products and treatment program already being used.
• Follow dosage instructions: Use the manufacturer’s recommended concentration and dosing procedure.
• Monitor the system: Testing helps determine whether the treatment is achieving the required water-quality conditions.
• Check documentation: Review the technical data sheet and safety data sheet before use.

Why Water Treatment Monitoring Matters

Adding chemicals to a water system is only one part of treatment. Regular monitoring helps determine whether the water chemistry remains within the intended treatment range.

For example, the Morven product information for NALFLEET Engine Water Treatment 9-108 recommends monitoring nitrite, chloride and p-alkalinity using an appropriate test kit. This demonstrates the connection between chemical dosing and water testing.

Nalco Water also describes monitoring and control as part of its industrial cooling-water treatment approach, particularly for detecting changes associated with corrosion, scaling and deposits.

A treatment program should therefore combine the correct chemical with appropriate testing, dosing and maintenance procedures.

Water Treatment Chemicals for Industrial and Marine Applications

Water treatment requirements vary considerably between industries. Manufacturing facilities, power plants, oil and gas operations, marine vessels, commercial facilities and water treatment plants may all require different chemical programs.

Morven Industrial’s Cleaning and Maintenance Chemicals range includes water treatment products from marine-focused brands such as Unitor and Drew Marine, alongside other maintenance chemicals.

Morven also has an Industrial Chemicals category serving sectors including manufacturing, oil and gas, construction and water treatment.

For marine applications specifically, the Unitor Chemicals Products category includes water treatment products covering cooling water, boiler treatment, water production, potable water and other marine applications.

Water Treatment Chemicals in Nigeria

When sourcing water treatment chemicals in Nigeria, the product should be selected according to the actual system rather than simply by chemical type or brand name.

For example, a boiler treatment chemical is not automatically suitable for an engine cooling-water system, and a product intended for industrial cooling water should not automatically be used for potable water.

Providing information about the equipment, water source, operating conditions, current treatment program and problem being addressed can help identify a more suitable treatment product.

Morven Industrial supplies water treatment chemicals for selected industrial and marine applications in Nigeria. Customers can provide their application requirements when making an enquiry so the appropriate product information can be reviewed.

Choose Water Treatment Chemicals Based on the Application

The main categories of water treatment chemicals include corrosion inhibitors, scale and hardness treatments, boiler treatments, cooling-water treatments, oxygen scavengers, sludge conditioners, potable-water stabilizers and microbiological-control products.

However, these categories should not be treated as interchangeable. The right product depends on the water chemistry, equipment, operating conditions and treatment objective.

If you are looking for a water treatment chemical for an industrial or marine application, start by identifying the water system and the specific problem that needs to be controlled. Then review the manufacturer’s technical information and dosing requirements before application.

Browse Morven Industrial’s Cleaning and Maintenance Chemicals range or contact Morven Industrial with your water treatment requirements.