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Chlorine is the most commonly used water disinfectant in applications that vary from treatment of drinking water and wastewater, pools and spas sanitization, to food processing and sterilization. Chlorine present in water binds with bacteria, leaving only part of the original quantity (free chlorine) to continue its disinfecting action.


£111.30 (exc.VAT)
£133.56 (tax incl.)
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Full Description Specification Manuals

Free Chlorine test kit, low and medium range

The HI 38018 free chlorine test kit, low and medium range is equipped with all you need to determine free chlorine levels in water.

Free chlorine reacts with ammonium ions and organic compounds to form chlorine compounds resulting in diminished disinfecting capabilities compared with free chlorine. These chlorine compounds together with chloramines form combined chlorine. Combined chlorine and excess free chlorine together result in total chlorine. While free chlorine has a much higher disinfectant potential, combined chlorine has a much higher stability and has a lesser volatility. There should be sufficient levels of unreacted free chlorine for adequate disinfection, but not so much as to become harmful.

Order information
The HI 38018 free chlorine, low and medium range test kit comes supplied with; HI 93701-0 free chlorine reagent, demineraliser bottle with filter cap for 12L, checker disc, glass vials with caps (2) and 3 mL plastic pipette.

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MethodChecker Disc
Range 0.00-0.70 mg/L
0.0-3.5 mg/L
Smallest Increment 0.02 mg/L
0.1 mg/L
Chemical Method DPD
Number of Tests 200
Weight 647 g