Cooling Water Treatment

Guardian Chemicals open recirculating cooling water treatment programs are designed to promote water conservation by maximizing cycles of concentration to ensure efficient and cost effective operation while minimizing maintenance and chemical costs.

AQUAGUARD 511 is a specially designed polymeric dispersant and yellow metal corrosion inhibitor. Highly effective at dispersing calcium phosphate, zinc phosphate and zinc hydroxide, it is intended for use in zinc phosphate or stabilized phosphate cooling water treatment programs.

AQUAGUARD 511 is designed to be used in combination with AQUAGUARD 510 to provide complete cooling water scale and corrosion control. The AQUAGUARD 510 and 511 treatment program provides effective scale inhibition and dispersant properties combined with complete ferrous and non-ferrous (yellow metal) corrosion inhibition.

In addition, your Guardian Chemicals Representative can help you address any microbial issues with our AQUAGUARD 600 series of products.



  • Dosage rates are easily tested with a handheld or in-line tester. Optional remote monitoring available. 
  • Highly concentrated cooling water treatment, delivering lowest cost to treat program.
  • Ideal water treatment solution for large open recirculating cooling systems
  • In combination with AQUAGUARD 510, forms a highly effective scale and corrosion inhibition program designed for even the toughest water conditions
  • High temperature capability (up to 70 C)
  • Reduces fresh water makeup requirements, conserving water and reducing operating costs
  • Independent control of dispersant portion of the program, results in lower overall chemical costs while addressing system needs.



AQUAGUARD 511 is formulated to handle the chemical requirements of large open recirculating cooling systems. Designed for corrosive waters with a calcium hardness of less than 1000 ppm and an M Alkalinity of 35 to 700 ppm depending on the pH of the cooling water.

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