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Nalco 93033 (currently marketed under the Ecolab brand following the merger) is a high-performance oxygen scavenger and corrosion inhibitor used primarily in industrial boiler water treatment.

Because this is an industrial chemical, the following guide focuses on its technical application, function, and safety protocols for professionals in the water treatment industry.

Primary Applications of Nalco 93033

How It Works in Practice

When injected into cooling tower water, Nalco 93033 performs three simultaneous actions:

  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.

Compatibility and Blowdown Considerations

Nalco 93033 is compatible with oxidizing biocides (e.g., chlorine, bromine, chlorine dioxide) but care must be taken to avoid simultaneous feed at the same injection point. Nalco recommends feeding the inhibitor separately from biocides, ideally by at least 12 inches of pipe distance or 5 minutes apart in time.

The product works best when the cooling system cycles of concentration (COC) are maintained between 3 and 6 cycles. Frequent blowdown (bleed-off) is necessary to control the buildup of total dissolved solids (TDS), but excessive blowdown wastes water. Use a conductivity controller to automate bleed cycles.

Nalco 93033 //free\\ May 2026

Nalco 93033 (currently marketed under the Ecolab brand following the merger) is a high-performance oxygen scavenger and corrosion inhibitor used primarily in industrial boiler water treatment.

Because this is an industrial chemical, the following guide focuses on its technical application, function, and safety protocols for professionals in the water treatment industry. nalco 93033

Primary Applications of Nalco 93033

How It Works in Practice

When injected into cooling tower water, Nalco 93033 performs three simultaneous actions: Nalco 93033 (currently marketed under the Ecolab brand

  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.

Compatibility and Blowdown Considerations

Nalco 93033 is compatible with oxidizing biocides (e.g., chlorine, bromine, chlorine dioxide) but care must be taken to avoid simultaneous feed at the same injection point. Nalco recommends feeding the inhibitor separately from biocides, ideally by at least 12 inches of pipe distance or 5 minutes apart in time. Primary Applications of Nalco 93033 How It Works

The product works best when the cooling system cycles of concentration (COC) are maintained between 3 and 6 cycles. Frequent blowdown (bleed-off) is necessary to control the buildup of total dissolved solids (TDS), but excessive blowdown wastes water. Use a conductivity controller to automate bleed cycles.