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414 Pinks and Blues: Trace's Phosphate Redux

Scaling UP! H2O

Release Date: 04/04/2025

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More Episodes

"Scaling is like debt—it’s always better to prevent it than to clean it up later."

Phosphate plays a crucial role in Industrial Water Treatment, yet it remains one of the most misunderstood chemicals. In this Pinks and Blues episode, Trace Blackmore revisits phosphate chemistry and its application in cooling systems, corrosion prevention, and scale inhibition.

Breaking Down Phosphate Chemistry
Phosphate exists in different forms, each with specific applications in water treatment. 

  • Orthophosphate (PO4³⁻): The simplest and most reactive form, used for corrosion inhibition. 
  • Polyphosphate: A longer chain of phosphate molecules that can hydrolyze into orthophosphate. 
  • Organic Phosphates: Phosphate compounds bonded with organic molecules, often used in scale inhibition. 
  • Total Phosphate: A combination of all phosphate types in a system. 


Phosphate Testing – What Every Water Pro Should Know

Phosphate levels must be carefully monitored to maintain system integrity. Trace explains: 

  • Why the orthophosphate test is the most reliable for phosphate analysis. 
  • How to convert different phosphate forms to orthophosphate for testing. 
  • The difference between the Molybdate Vanadate Method (yellow test) and the Ascorbic Acid Method (blue test). 
  • The importance of accurate dilution and testing procedures to prevent measurement errors.

Challenges and Considerations in Phosphate Treatment 

  • Biological Growth: Phosphate serves as a nutrient, promoting microbial growth if not controlled properly. 
  • Environmental Regulations: Certain facilities may have phosphate discharge limits. 
  • Calcium Phosphate Scaling: High temperatures and improper phosphate dosages can cause severe scaling issues.

Best Practices for Phosphate Management 

  • Monitor carbon and alkalinity levels to determine the best phosphate formulation. 
  • Use stability indices (e.g., Ryzner Stability Index, Langelier Saturation Index) to predict scale formation. 
  • Adjust treatment strategies based on pH levels and system conditions to avoid unintended scale buildup. 
  • Always verify environmental discharge limits when using phosphate-based treatments.

Mastering phosphate chemistry and testing techniques ensures better system performance, cost efficiency, and regulatory compliance. This episode empowers water professionals to optimize their approach to phosphate-based treatments. Tune in to learn practical strategies for optimizing phosphate levels, preventing scale, and ensuring system efficiency.

Stay engaged, keep learning, and continue scaling up your knowledge! 


Timestamps
 

03:16 Trace Blackmore shares the importance of Quarterly Planning for Business and Personal Goals

06:30 Upcoming Events for Water Treatment Professionals  

08:20 Water You Know with James McDonald 

12:03 – Introduction to Phosphate and Its Role in Water Treatment 

18:31 – Understanding Phosphate Forms: Orthophosphate, Polyphosphate, Organic Phosphate 

21:32 – Phosphate as a Corrosion & Scale Inhibitor in Cooling Systems

34:33 – Testing Phosphate: Why the Orthophosphate Test is Key 

51:37 – The Importance of Understanding Water Chemistry Before Selecting Treatment Plans


Connect with Scaling UP! H2O
 

Submit a show idea: Submit a Show Idea 

LinkedIn: in/traceblackmore/ 

YouTube: @ScalingUpH2O 
 

Click HERE to download Episode’s Discussion Guide   


Scaling UP! H2O Resources Mentioned 

Audible 

12 Week Year 

Ep 046 The One About Phosphate Testing 

Ep 024 The One With All the Questions

Taylor Technologies Test Procedures:  PhosphonateAzole

AWT (Association of Water Technologies)

Scaling UP! H2O Academy video courses

Submit a Show Idea

Phosphonates


Water You Know with James McDonald
 

Question: What is the process called to evaluate the performance and efficiency of a water softener by taking regeneration water samples, measuring their salinity, and interpreting their results?

2025 Events for Water Professionals 

Check out our Scaling UP! H2O Events Calendar where we’ve listed every event Water Treaters should be aware of by clicking HERE.