Closed System Corrosion Inhibitor


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WTPCW25 is a very effective corrosion inhibitor for modern air conditioning chilled water systems, closed loop cooling systems and hot water heating boilers.

WTP CW25 contains:

  • sodium nitrite
  • buffers
  • a copper corrosion inhibitor


  • compatible with alcohol and glycol anti-freezes
  • easily applied
  • single solution treatment
  • provides economical waterside protection for mixed metal systems containing copper, brass and ferrous based metals


Physical State Pale Yellow Liquid
Specific Gravity (SG) 1.19 – 1.22

Dosing and Testing

  • 5 litre WTPCW25 per cubic metre of water in system. (0.5% system volume)
  • Dose is usually added to closed systems by utilising a pot feeder, or by a manually operated chemical injection pump.
  • Recommended normal concentration level is 800 – 1200 ppm of Nitrite. A drop test kit is available to determine correct levels in the system (WTPTK106).


Please refer to material safety data sheet for detailed handling/storage instructions. WTPCW25 is alkaline and contact with skin, eyes and clothing should be avoided. In case of contact flush with water.


WTPCW25 treatments are shipped in 25 litre non-returnable drums.


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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