Nalco 93033 May 2026

NALCO 93033 is a liquid oxidizing biocide primarily used for chemical water treatment in industrial cooling systems and boilers. Key Uses and Applications Cooling Systems:

It acts as a disinfectant to ensure the long-term proper functioning of cooling water circuits in machines and lasers. Boilers and Steam Lines:

It is used to treat systems where the water or steam does not come into contact with edible products in food processing areas. NSF Category G7: The product is registered under the NSF White Book

for use in and around food processing areas, provided there is no direct contact with food. Physical Properties and Handling Appearance: Typically a clear, colorless to light green-yellow liquid. Composition: Often contains chlorine-based oxidizing agents. Shelf Life:

It has a shelf life of approximately one year when stored at a maximum temperature of 25°C.

It is considered toxic to aquatic organisms and is generally non-flammable. Standard safety protocols require the use of goggles and face shields during handling due to potential skin and eye irritation. Brazosport College For detailed safety protocols, you can consult the official Ecolab Safety Data Sheets NSF Registration letter compatibility with different metal surfaces? nalco 93033 - NSF

Understanding NALCO 93033: A Comprehensive Guide to Cooling Water Disinfection

NALCO 93033 is a specialized chemical treatment solution developed by Nalco Water, a brand of Ecolab. Primarily used as a cleaning biocide, it is designed for the disinfection and maintenance of industrial cooling circuits, specifically in regions such as the Netherlands. Core Applications and Industry Use

The primary function of NALCO 93033 is to control biological growth within cooling systems. It is essential for:

System Commissioning: Used during the startup of new cooling circuits to ensure they are free from initial microbial contamination. nalco 93033

Maintenance Cycles: Applied for approximately two hours during the cleaning cycle prior to regular commissioning or during routine system cleaning.

Targeted Disinfection: Effective in both copper and aluminum cooling circuits to manage bacteria that can cause corrosion and reduce heat transfer efficiency. Regulatory and Safety Standards

NALCO 93033 is registered with NSF International under Category Code G7.

Food Processing Safety: It is acceptable for treating boilers, steam lines, and cooling systems in food processing areas, provided the treated water or steam does not come into direct contact with edible products.

Storage Requirements: The product has a shelf life of one year when stored at a maximum temperature of 25°C. It should be stored in a well-ventilated area, away from strong oxidizers like chlorine or peroxides to prevent hazardous reactions. Physical Properties and Handling

Based on technical data, NALCO 93033 typically presents as a clear, light-yellow liquid.

Flash Point: 197°F (PMCC), indicating it is combustible under specific high-heat conditions.

Personal Protection: Operators should use chemical-resistant gloves (nitrile or butyl rubber), goggles, a face shield, and protective clothing to prevent skin and eye irritation.

Environmental Caution: The product is toxic to fish and should not be discharged directly into public waterways or natural bodies of water. Benefits of Biological Control NALCO 93033 is a liquid oxidizing biocide primarily

Maintaining a system with biocides like NALCO 93033 provides several operational advantages:

Prevents Corrosion: By eliminating bacteria that produce corrosive by-products, the integrity of metal surfaces is preserved.

Enhances Efficiency: Keeping heat exchange surfaces free of biofilm (slime) ensures the system operates at peak thermal performance.

Reduces Downtime: Regular cleaning cycles prevent the sudden failure of cooling units due to severe fouling or blockage.

For facility managers or engineers looking to implement a new water treatment program, it is recommended to consult with a Nalco Water Representative to determine the exact dosage and compatibility with specific system metallurgy.

I’m unable to find a specific product or document titled “nalco 93033” in my available references. It’s possible that:

  1. It’s a typo – Nalco (now part of Ecolab) typically uses 5- or 6-digit product codes (e.g., NALCO® 93033 might be a misremembered number).
  2. It’s an internal or legacy code – Not publicly documented.
  3. It’s a batch/lot number – Not a product guide.

What to do next:

If you can provide more context (e.g., what the product looks like, where it’s used), I may be able to help identify the correct Nalco product.

How It Works in Practice

When injected into cooling tower water, Nalco 93033 performs three simultaneous actions: It’s a typo – Nalco (now part of

  1. Threshold Inhibition: The polymer components interfere with crystal lattice formation of calcium carbonate, meaning scale particles cannot adhere to heat transfer surfaces. Even at low concentrations (a few ppm), the product raises the "threshold" of saturation before precipitation occurs.
  2. Passivation: Orthophosphate reacts with iron to form a thin, adherent layer of ferric phosphate, which blocks anodic sites and reduces general corrosion rates to below 1–2 mils per year (MPY)—the industry standard.
  3. Chelation: Minor chelating agents bind to metal ions like iron and manganese, preventing them from depositing as sludge or catalyzing under-deposit corrosion.

Safety, Handling, and Storage

Nalco 93033 is an acidic liquid (pH 1.5-3.5). It is not classified as acutely toxic, but it is corrosive to eyes and skin.

How Nalco 93033 Works: The Chemistry in Action

To understand why Nalco 93033 is effective, you must understand the three enemies of a cooling system.

Primary Applications of Nalco 93033

You will find Nalco 93033 deployed in the following industrial sectors:

1. Commercial HVAC Cooling Towers

Large office buildings, hospitals, and university campuses use Nalco 93033 to protect chillers and condenser water loops. The product is approved for systems with copper coils and aluminum fin heat exchangers.

Target Residual Levels

To maintain the passive film, you must maintain specific residuals in the recirculating water:

| Parameter | Target Range | | :--- | :--- | | Orthophosphate (as PO₄) | 4 – 8 mg/L | | pH | 7.0 – 8.0 | | Total Hardness (as CaCO₃) | 50 – 600 mg/L | | Conductivity | < 3,500 µS/cm |

3. Dispersant Action

Suspended solids like silt, clay, and iron oxides naturally concentrate in cooling towers. Without a dispersant, these particles agglomerate and settle in low-flow zones. Nalco 93033’s polymer coats each particle with a negative charge, causing them to repel each other and remain in the bulk water flow.

Chemical Composition and Mechanism of Action

While the exact proprietary formula of Nalco 93033 is protected, technical data sheets and industrial analyses confirm it belongs to the family of stabilized phosphate-based inhibitors. Its key active ingredients include: