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JLT Series Flocculators

Digital Flocculators in 4 and 6 positions with timer and illuminated back panel  to allow standard conditions to be met during Jar Testing. 
3 years warranty
JLT 4 F105A0108
JLT 6 F105A0109

Easy to use and Reliable

Easy to use and Reliable
  • Microprocessor controlled operating time for unattended operation
  • Illuminated back panel simplifies the observation of the samples
  • Stirring rods adjustable in height without tools
  • Digitally selectable speed from 10 to 300 rpm
  • Identical speed and time for all positions for comparable results
  • Reliable and repeatable results from VELP stirring quality
  • Precise speed from an electronically controlled DC gear motor
  • Strong resistance to chemical and mechanical corrosion
  • High visibility LED displays for speed and time
  • Choice of 4- or 6-place models

What is JAR TEST?

What is JAR TEST?

Jar testing is a pilot-scale test of the treatment chemicals used in a particular water plant.
It simulates the coagulation/flocculation process in a water treatment plant, helping the operator in the determination of the right amount of treatment chemicals, and, thus, in improving the plant’s performance.

Jar testing entails adjusting the amount of chemicals and their sequence in which they are added. The sample requires to be stirred so that the formation, development, and settlement of floc can be watched just as it would be in the fullscale treatment plant.

The operator then performs a series of tests to compare the effects of different amounts of flocculation agents at different pH values to determine the right size floc.


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Construction material: epoxy painted metal structure
Models: JLT 4 4 positions
JLT 6 6 positions
Back panel: disconnectable illuminated
Stainless steel stirring rods: adjustable in height by a selfblocking chuck
Monoselector: same speed for each rod
Power: JLT 4 11 W
JLT 6 19 W
Dimensions (WxHxD): JLT 4 645x347x260 mm (25.4x13.7x10.2 in)
JLT 6 935x347x260 mm (36.8x13.7x10.2 in)
Weight JLT 4 13 kg (28.6 lb)
JLT 6 17 kg (37.4 lb)
Electronic speed control: from 10 to 300 rpm
Speed setting interval: 1 rpm
Microprocessor controlled timer: 0÷999 min or 0 ÷99 hours (or continuous)

Brochures & Leaflets

VELP Scientifica invites you to download brochures and leaflets in order to explore our premium quality solutions and to have all the major key arguments, features and specifications of a product in your hands, in any place, and at any time.

Instruction manuals

Download the instruction manual that contains all the main technical specifications of the instrument and the necessary information for its correct use.

Comparison tables

Select the category of products you are interested in and this tool will give you an easy overview of what is available at VELP in order to find the product that is perfect for you. These comparison tables provide a brief description with side by side features from basic equipment to the most advanced analytical solutions.


Our compliance to statutory rules and regulations worldwide.
With the CE mark, VELP Scientifica declares that the products are designed and manufactured in compliance with the essential safety requirements of the European Directive on Safety.
The Certification Body (CB) Certificate is an international program created by the IECEE for the acceptance of product safety test results among participating laboratories and certification organizations around the world.
The cNEMKOus mark ensures this product is designed and manufactured in compliance with the International Directive on Safety IEC/EN 61010-1. The cNEMKOus mark has the same legal status as any other NRTL/SCC accredited marks, for U.S. and Canada.


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