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Floc Tester ET840

The Lovibond® Floc Tester ET840 provides a controlled and flexible solution for evaluating coagulation and flocculation in water and wastewater treatment. By simulating treatment conditions on a smaller scale, it allows operators to compare flocculants, assess different dosages and optimise treatment conditions before making changes to the full-scale process.

With four stirring positions, programmable operating times and adjustable stirring speeds, the ET840 provides controlled and reproducible testing for routine laboratory applications. Testing can be carried out in accordance with ASTM D2035-19, supporting a consistent approach to coagulation-flocculation studies.

Controlled and Reproducible Testing

The ET840 allows two stirring speeds to be programmed to reproduce different stages of the treatment process. Speed changes can be controlled automatically by time or carried out manually, providing flexibility for different testing procedures.


Digital speed adjustment from 20 to 250 rpm and a programmable timer from 1 to 240 minutes, with continuous operation also available, give operators precise control over test conditions.


Four stirring positions allow multiple samples to be compared simultaneously, while the continuously adjustable stirrer height accommodates beakers from 500 mL to 1,500 mL.

Enhanced Sample Visibility

A key feature of the ET840 is its flexible rear and floor lighting, providing clear illumination of samples throughout the test. Improved visibility makes it easier to observe floc formation, settling behaviour and differences between samples.


A large illuminated display provides clear visibility of operating settings, while the intuitive, language-independent controls make the instrument straightforward to operate during routine laboratory testing.


Combined with corrosion-resistant stainless steel stirrers and a robust laboratory design, the ET840 provides a practical solution for regular coagulation and flocculation studies.

Key Features

  • Coagulation-flocculation testing in accordance with ASTM D2035-19
  • Four stirring positions for simultaneous sample comparison
  • Suitable for 500–1,500 mL beakers
  • Digital speed adjustment from 20–250 rpm
  • Two programmable stirring speeds
  • Time-controlled or manual speed changes
  • Programmable timer from 1–240 minutes
  • Continuous operation available
  • Continuously adjustable stirrer height
  • Corrosion-resistant stainless steel stirrers
  • Flexible rear and floor lighting for improved sample visibility
  • Large illuminated display
  • Intuitive, language-independent operation
  • Robust design for routine laboratory use

Applications

  • Drinking Water Treatment
  • Wastewater Treatment
  • Raw Water Treatment
  • Coagulation and Flocculation Studies
  • Flocculant Selection
  • Chemical Dosing Optimisation
  • Laboratory Treatment Simulations
  • Water Treatment Process Development

   Order Code   Description 
2419113ET840 benchtop with 4 stirring positions
4191651000ml, glass beaker
 416166 1000ml, plastic beaker
 419167 1500ml, glass beaker

Floc Tester Leaflet