Tannin based multifunctional boiler water treatment – 6305


Available in cases of 4 x 5kg bottles

Can be dosed using an Accepta Ultra Feeder Board

Description below


Tannin Based Scale & Corrosion Inhibitor for Steam Boilers & Closed Systems

Accepta 6305 is a Tannin based multi-functional boiler water treatment in solid form for softened water make-up application. This is a proprietary boiler water treatment containing Natural Tannins, high performance sludge & scale polymer conditioners and alkalinity builders.

Accepta 6305 is especially well suited for those systems with a low temperature feed water and also for feed systems that have either a feed pre-heater or economizer.

Accepta 6305 contains only ingredients approved under the United States Food & Drug Administration Regulations Title 21, Section 173.310 Boiler Water Additives.


Target is 140 ppm of Tannin in the boiler water, or sufficient to control feedline corrosion.

Testing Method In Boiler Water
Tannin – Steam Boiler 120-160 ppm
Tannin – Loop with Aluminum Exchanger 100-120 ppm


System pH control is critical and will be a function of boiler feed chemistry and metallurgy, but the caustic alkalinity in the boiler should typically be maintained in the range of 250 and 750 ppm as CaCO3


Appearance:               Solid – Dark Brown

Odour:                         mild

pH:                              10  @1%


Accepta 6305 should be kept away from acids and oxidising agents in a cool dry area. Properly stored, the product will remain effective for 24 – 36 months. Consult Safety Data Sheet for further information


Feed Accepta 6305 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 6305 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