Dilute Sodium Hypochlorite On-Site for Storage, Bulk Transport Economies

In order to ship and/or store the product more economically, sodium hypochlorite (NaOCl) is often produced at concentrated strengths and diluted at the point of use. Typical plant water is not suitable for use in the dilution process, however it is not necessary to incur the expense of de-mineralized water. Softened water – with total hardness reduced to 0 to 5 ppm – is acceptable as the diluent.

In order to easily determine the amount of water needed to dilute any strength of sodium hypochlorite to achieve a specified strength of final product, Powell has created the interactive program below. The amount of water added to dilute strong sodium hypochlorite calculated in this interactive program is approximate and accurate to within plus or minus 2%. Further accuracy is easily achieved by using the actual known specific gravity of the strong bleach. To calculate the amount of water to add to the strong sodium hypochlorite, follow the instructions below:

Input Values for Strong Sodium Hypochlorite

Input value for temperature and grams per liter of available chlorine of the strong sodium hypochlorite. Notice that weight percent sodium hypochlorite, weight percent available chlorine, and trade percent will be indicated.

Default values are provided for the excess sodium hydroxide and the sodium chlorate. These values are typical for a continuous system. Different levels of excess sodium hydroxide and sodium chlorate will require slightly different amounts of water for dilution.

If the gpl of the strong sodium hypochlorite is not known, but the weight percent sodium hypochlorite is known, adjust the gpl available chlorine up or down until the known weight percent sodium hypochlorite is indicated. This instruction also applies to the trade percent available chlorine and weight percent available chlorine. Input Values for Diluted Sodium Hypochlorite

Input the desired diluted strength of sodium hypochlorite into the program. The input number is in grams per liter of available chlorine. If this number is not known, adjust the gpl available chlorine up or down until the desired weight percent sodium hypochlorite is indicated. This instruction also applies to the trade percent available chlorine and weight percent available chlorine.

Program will Return Amount of Dilution Water Required

The amount of water to add to the strong sodium hypochlorite is provided in both volumetric and mass units of measure:

  • Volumetric measurement – per unit volume of strong sodium hypochlorite, i.e., gallons, liters, or cubic meters.
  • Mass measurement – per unit mass of strong sodium hypochlorite such as pounds, i.e., kilograms or metric tons.
For More Information

Powell has built continuous and batch sodium hypochlorite dilution systems for over 30 years and has provided equipment for major companies throughout the world. Please contact Powell for further information on all your sodium hypochlorite dilution equipment requirements.