What is Jar testing?

Jar testing is a laboratory procedure used to simulate coagulation and flocculation processes in a water treatment plant.

The process allows engineers and operators to evaluate:

  • Coagulant performance and selection
  • Flocculant selection
  • Chemical dosage requirements
  • pH Optimisation
  • Settling performance

This ensures the most effective chemical programme before full-scale plant implementation.

What is required for Jar testing?
  • 20-25L of raw water or wastewater
  • Basic information about the treatment process
  • Current chemical programme
  • Objective for the testwork (reduce cost, reduce COD, reduce turbidity etc)
  • Settling performance
Coagulation jar test

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