Closed System Inhibitor


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WTPT321 is a closed system corrosion Inhibitor for use in Medium and High pressure heating systems.

WTPT321 is based upon a blend of natural tannins, organic alkalinity builders and corrosion inhibitors.

This product is ideally suited to large industrial and institutional systems where cost effective protection and ease of monitoring is required. WTPT321 can be applied where demin/deionised water make up is used and low total dissolved solids is required.


Physical state Dark brown liquid
Specific gravity 1.111
pH 11-12

Dosage and Testing

  • WTPT321 dosage will be calculated and advised by our local water treatment chemist.
  • Suggested dosage is 2 to 5 litres per 1000 litres of system water to achieve 120 – 160ppm as Tannin.
  • A WTPTK109 test can be used to determine correct values in the system.


WTP T321 can be dosed to systems using manual dosing pots or metering pumps.


Please refer to material safety data sheet for detailed handling/storage instructions.  Avoid prolonged contact. Not to be taken internally.  Wash thoroughly with water, and for eyes seek medical attention.


WTPT321 treatments are shipped in 25 litre or 200 litre polythene drums.


Field Representatives will work closely with customer personnel to assure the effective application of the water treatment programme. Regular service calls can be provided by qualified personnel.

More Information

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The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The company shall not be held liable for any damage resulting from handling, contact, mis-use or mis-application of the above product. In all instances the user should satisfy themselves that this product is suitable for the anticipated application and should carry out suitable and sufficient risk/COSHH assessments and a method of use statement.

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