Boiler Treatment based on Hexametaphosphate


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WTPS22 is a boiler treatment based on sodium hexametaphosphate, it is used to precipitate calcium hardness as a mobile phosphate sludge.

WTPS22 is formulated with polymers and a dispersant that condition and mobilize the resultant phosphate sludge and aid in removal during boiler blow down.

WTPS22 delays precipitation of hardness salts in feed lines. It may be injected continuously to feed water containing hardness salts without the formation of excessive scale in the pipe line.

Product Data

Physical State Clear liquid
Specific gravity (sg) @ 20oC 1.18
pH of product 6.8

Treatment and Dosing

WTPS22 is dosed to maintain a phosphate reserve within set limits that are determined by the operating conditions of the boiler (e.g. boiler pressure, chemical characteristics of the water employed) according to BS 2486.

Product ml per M3 feed = 5 x (60/C + 0.6 x H)

C= Boiler Concentration Factor         H = feed hardness

WTPS22 may be injected using a dosage pump or a dosage pot as appropriate to the particular installation. Its viscosity permits handling by convention dosage pumps without dilution but it may be diluted if desired using softened water or condensate.

WTPS22 is not corrosive to steel mixing tanks or dosage pumps in concentrated or dilute form. However, if dosed direct to hot boiler shells use a stainless steel injection fitting.


Please refer to material safety data sheet for detailed handling/storage instructions.

  • Avoid contact with eyes, skin and clothing.
  • In case of contact, immediately remove contaminated clothing and wash skin with soap and water.
  • For eyes, flush with plenty of water and seek medical attention.
  • Harmful if swallowed.


WTPS22 treatments are shipped in 25 litre and 200 litre non-returnable drums.


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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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