Drinking Water Treatment - Disinfection: Save chemical costs and maintain a consistent residual 

Regardless of the type of disinfectant used, analytical testing can help you comply with regulations, maximis disinfection efficiency, optimize chemical feed pump rates, reduce the risk of disinfection byproducts, and control taste and odour issues.

A wide range of analytical methods and instrumentation is available to address the specific needs of each unique plant.






Analogue, photometric analyser for determination of free or total chlorine in accordance with DIN EN ISO 38408.
  • Measuring range: 0.03 – 5 mg/L Cl2
  • Highest possible acceptance and reliability due to photometric DPD method
  • Fast, accurate and automatic measurements
  • Minimal maintenance – typically 15 minutes per month
  • Factory calibrated – no re-calibration required

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Digital, amperometric sensors on panel for the reagent-free determination of free or total chlorine.
  • Measuring range: 0.03 – 10 mg/L Cl2
  • Real-time measurement to allow fast response
  • Low operating costs thanks to reagent-free determination
  • Very stable 3 electrode sensor

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Hach DR 3900 VIS- and DR 6000 UV-VIS photometers are engineered to achieve exceptional analytical accuracy in a simple testing format.
  • High laboratory efficiency – more than 220 pre-programmed analysis methods directly available
  • Highly accurate, reliable and traceable measurements
  • Easy and transparent working process

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Portable and robust, micro-processor controlled colorimeter with power-saving LED technology.
  • Pre-programmed with 90 HACH Methods.
  • Rugged construction – dustproof, waterproof, shockproof
  • Designed for use in the field
  • Easy to use – menu driven, step by step analysis
  • Instant field ready – ready to use out of the box
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All-inclusive system preassembled on a panel (without controller) for reagent-free determination for chlorine dioxide.
  • Low operating costs thanks to reagent-free determination
  • No interference with chlorine, bromine and hydrogen peroxide
  • Stable measurements thanks to the flow-through cell
  • Easily installed premounted flow-through system
  • Minimal maintenance thanks to automatic cleaning

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HACH LANGE DR 3900 VIS- and DR 6000 UV-VIS photometers are engineered to achieve exceptional analytical accuracy in a simple testing format.
  • High laboratory efficiency – more than 220 pre-programmed analysis methods directly available
  • Highly accurate, reliable and traceable measurements
  • Easy and transparent working process

Request a quote



HACH LANGE DR 3900 VIS- and DR 6000 UV-VIS photometers are engineered to achieve exceptional analytical accuracy in a simple testing format.
  • High laboratory efficiency – more than 220 pre-programmed analysis methods directly available
  • Highly accurate, reliable and traceable measurements
  • Easy and transparent working process

Request a quote


The DR 6000 UV-VIS photometer is engineered to achieve exceptional analytical accuracy in a simple testing format.
  • High laboratory efficiency – more than 240 pre-programmed analysis methods directly available
  • Highly accurate, reliable and traceable measurements
  • Easy and transparent working process
  • Data storage: 5000 values

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The process sensor UVAS plus sc is a precise self-cleaning probe for delay-free measurement of SAC254 (total parameter for dissolved organic substances) in water according to DIN 38404.
  • High precision and high resolution measurements
  • No sampling or sample conditioning
  • Instant measured values without reagents
  • Measurement directly in the medium or in bypass
  • Self-cleaning probe

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Immersion, flow-through or built-in probe with integrated electronics.
  • Longer service life
  • Reliability with built-in encapsulated preamp
  • Plug and play with SC controllers

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The HQD digital meter/electrode system combines reliability, flexibility and easy handling.
  • Accurate and quick measurements
  • For single or dual parameters measurements
  • Easy to use with innovative menu design
  • INTELLICAL intelligent electrodes are recognized automatically and store all relevant data

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HACH LANGE DR 3900 VIS- and DR 6000 UV-VIS photometers are engineered to achieve exceptional analytical accuracy in a simple testing format.
  • High laboratory efficiency – more than 220 pre-programmed analysis methods directly available
  • Highly accurate, reliable and traceable measurements
  • Easy and transparent working process

Request a quote



Portable and robust, micro-processor controlled colorimeter with power-saving LED technology. Pre-programmed with 90 HACH Methods.
  • Rugged construction – dustproof, waterproof, shockproof
  • Designed for use in the field
  • Easy to use – menu driven, step by step analysis
  • Instant field ready – ready to use out of the box

Request a quote



Powder pillows are available for a large number of parameters and measuring ranges. Evaluation to be carried out with e.g. a HACH LANGE photometer.
  • Long shelf life – hermetically sealed in aluminum foil pillows
  • Low-price method

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Stay up, running and in compliance with Service

By performing recommended maintenance and taking advantage of Hach Service to provide you with a calibration certificate on each visit, both you and your regulator can have complete confidence that your instruments are accurate and you are delivering the best water you can.


Peace of mind with Hach Service:
•    Maximum instrument uptime
•    Reliable operating and maintenance costs
•    Confidence to meet regulatory compliance
•    Warranty extension options


Watch this video! (Where are you on the chlorine curve?)