Fungicide, bactericide, algaecide, and molluscicide Oxidising Biocide – 6403

Accepta 6403 is available in 2.5kg HDPE jars (4 x 2.5kg jars per case).

Can be used in conjunction with Accepta 6404 DBNPA

Can be dosed by usage of the Accepta Biocide Feeder

Description Below


Accepta 6403 Bromine Based Biocide

Active Ingredients: 1-bromo-3-chloro-5, 5-dimethylhydantoin, 1,3-dichloro-5, 5-dimethylhydantoin and 1,3-dichloro-5-ethyl-5-methylhydantoin.

Accepta 6403 is a halogenated hydantoin that functions as an effective microbiocide through the controlled release of active bromine and chlorine.

Accepta 6403 is a fungicide, bacteriacide, algaecide, and molluscicide for recirculating and once-through water systems.

Accepta 6403 is recommended to control bacterial, fungal, and algal slimes in evaporative condensers, recirculating cooling tower systems, influent systems, industrial wet scrubber systems, sewage systems, auxillary water systems, photo processing wash water, air washers, and brewery pasteurizers.

Accepta 6403 is more efficacious toward biofilm than either free chlorine or free bromine alone. The increased stability of the combined halogen in systems with high halogen demand allows greater diffusion into the biofilm without losses due to unwanted side reactions. Chlorine & Bromine have proven efficacy against pathogenic microorganisms including Legionella, at levels required by the system, HSE ACoP L8, HS(G) 274, system water type, along with risk assessment data.

Use in conjunction with Accepta 6404 (DBNPA)

Accepta 6404 is an activator for residual bromide from DBNPA degradation. When used as a cooling tower microbiocide, DBNPA (Accepta 6404) ultimately decomposes to bromide ion.  When supplemented with Accepta 6403, the bromide ion in the re-circulating water is activated to hypobromous acid, effectively introducing an excellent algaecide. Both products are EPA registered, thereby providing an excellent oxidizing and non-oxidizing bio program.

Stand-Alone Use

Accepta 6403 can be used in a stand-alone capacity as a chlorine/bromine source.  Product contains no binders and is effective in both alkaline and acidic pH ranges. Available chlorine % Cl2: 43%, Available bromine % Br2: 43%.


Accepta 6403 application rates for industrial recirculating cooling water systems will depend upon the conditions of the system prior to treatment initiation. Systems which are heavily contaminated should be cleaned prior to product use. Apply Accepta 6403 to maintain a free halogen residual in the re-circulating water. 5000 litres of system volume, dosed at 1 ppm, would require 6 grams of Accepta 6403.


Appearance:                 Solid Granular –Off White

Odour:                         slight stinging

pH:                               3.67@ 10g/l (25°C)


Accepta 6403 should be stored in a cool (<25°C) dry area. Properly stored, the product will remain effective for 24- 36 months. Consult Safety Data Sheet for further information.


Accepta 6403 is available in 2.5kg HDPE jars (4 x 2.5kg jars per case).


Feed Accepta 6403 using an Accepta Biocide Feeder board system.

Precision dosing should be carried out using a dosing pump or eductor.

Multiple systems can be dosed from one feeder.

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

For further technical assistance concerning Accepta 6403 please contact Accepta.

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