Accepta 6401 – Calcium Hypochlorite briquettes for potable water sources

Accepta 6401 is available in 3.6 kilo containers (4 to a case).

Can be used in conjunction with Accepta 6404 DBNPA to create Hypobromous acid

Suitable for use with Accepta Ultra Dissolver boards.

Description below


Accepta 6401 Microbiocide:

Active Ingredients: Calcium Hypochlorite briquettes are a dry source of chlorine. It contains approx. 65% available chlorine.  It is used in controlling the growth of bacteria in potable water systems. When used with a HOCL specification dissolving system Accepta 6401 produces a stable solution of hypochlorous acid which is a powerful biocide for used in potable applications.

Accepta 6401 can be used stand alone or in conjunction with 6404 DBNPA.

Use in conjunction with Accepta 6404 (DBNPA)

Accepta 6401 is an activator for residual bromide from DBNPA degradation. When used in a cooling tower, DPNPA (Accepta 6404) ultimately decomposes to bromide ion but when supplemented with Accepta 6401, the bromide ion in the re-circulating water is activated to hypobromous acid, effectively introducing an excellent algaecide. Both products provide an excellent oxidizing and non-oxidizing bio program.*

Accepta 6401 is a DWI (BS EN 900:2007) approved treatment for potable water systems and is widely used to control legionella and other pathogenic bacteria in hot and cold water systems. Chlorine has proven efficacy against pathogenic microorganisms including Legionella, at levels required by the system, L8 (HS(G) 274), system water type, along with risk assessment data.


Accepta 6401 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 6401 to maintain a free halogen residual in the re-circulating water.

5000 liters dosed at 2 ppm would require 9-10g of Accepta 6401. This would require about 1 litres of solution per 1,000 litres of system volume (solution strength is 1800 ppm)


Appearance:                 Solid – Off White tablets

Odour:                          Chlorine Odour

pH:                               10.5-11.5 @ 10g/l (20°C)


Accepta 6401 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 6401 is available in 3.6 kilo containers (4 to a case).


Feed Accepta 6401 using an Accepta board system.

Available in three types:

  • Gravity Fed – No pump needed, requires controller relay or timer
  • Electronic Level Control – Pump needed
  • Mechanical – Pump needed

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

For further technical assistance concerning Accepta 6401 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