Accepta 2591 – Organic Biocide for Open and Closed Cooling Water and RO Systems

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Description Below


Accepta 2591 is a broad spectrum non-oxidising biocide solution based on DBNPA for use in a range of applications such as cooling water, pulp and paper processing, metalworking fluids and the treatment of RO membranes. It is particularly rapid in its action and has an excellent environmental profile because it degrades quickly and naturally.

Accepta 2591 will rapidly kill a wide range of bacteria including Legionella bacteria. At 100 ppm Legionella is killed in 2 hours.

Accepta 2591 delivers a synergistic performance with halogen.

Accepta 2591 also exhibits rapid breakdown (hydrolysis) to low toxicity end products. The rate of breakdown increases with temperature and pH.

Product Benefits

  • Fast acting, effective DBNPA based biocide.
  • Breaks down to low toxicity end products.
  • Suitable for a range of application.
  • Effective against legionella
  • A good secondary biocide for systems treated with halogen.

Typical Properties

Composition: A solution of 2,2-dibromo-3-nitrilopropionamide in water and glycol.
Appearance: Pale straw
Sg: 1.20 – 1.25
 pH: 2.5 – 3.5

*Full details of the product properties are available in the Safety Data Sheet. See below.

Application & Dosage Information

Accepta 2591  can be dosed by hand or through automatic dosing equipment.

Dosage Rates

Cooling water treatment

Accepta 2591 should be dosed intermittently at a rate of 50 – 200ml/m3 of system volume. The required frequency and exact dosage will be dependent on the microbial fouling of the system.

Accepta 2591 would normally be used at part of a total cooling treatment package incorporating another non-oxidising biocides and inhibitor to control scale and corrosion.

RO Treatment

Off-line CIP Addition

A dosage to achieve of 50 – 200ml/m3 should be added based on the combined volume of the CIP tank and the membrane housings diluted with RO Permeate.

On-line Shock Treatment

Dose to the feedwater to the RO plant at a rate of 10 – 50ml/m3 for a period of at least 1 hour and repeated as required to restore performance and maintain the membranes.

NB Where bisulphite is used to remove chlorine upstream of the RO the dosage should be suspended for 15 minutes prior to starting the on-line treatment

Testing – A DBNPA test kit is available in various formats from Accepta.

It is always advisable to carry out a ‘Control Of Substances Hazardous to Health’ (COSHH) assessment before use.

Safety, Storage & Handling

For full details concerning safety precautions, storage and handling procedures for this product please refer to the latest Safety Data Sheet. To request the latest MSDS for this product please fill out the form below.

    Additional information

    Weight 25 kg