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Welcome to the ABC of water treatment

Each week, we highlight essential chemicals and their applications to help you optimize your water treatment processes. This week, we spotlight calcium hypochlorite, a crucial component for maintaining water safety and quality. 

What is calcium hypochlorite?

Calcium hypochlorite is a powerful disinfectant widely used in water treatment. Formed by reacting lime with chlorine gas, this white, solid powder releases chlorine when dissolved in water, making it essential for killing bacteria, viruses, and other pathogens.

Read on to learn more about its applications, benefits and other key insights.  

Applications in water treatment 

  • Swimming pool sanitization: maintains hygiene by controlling algae, bacteria, and other microorganisms, ensuring safe swimming conditions 
  • Disinfection of drinking water: kills bacteria, viruses, and other pathogens, ensuring water is safe for consumption. Ideal for emergency disinfection
  • Wastewater treatment: disinfects treated effluent before discharge, preventing the spread of waterborne diseases and protecting the environment

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Product benefits

  • High disinfection efficiency: rapidly eliminates a wide range of pathogens due to its high chlorine content 
  • Residual protection: continues to disinfect water over time, providing ongoing protection against microbial recontamination 
  • Versatility: suitable for various applications, available in different forms (granular, tablet, powder) 
  • Cost-effective: provides high efficiency at a relatively low cost compared to other disinfectants 

Properties, safety and usage guidelines

Properties

  • Chemical formula: Ca(OCl)₂ 
  • Appearance: white powder 
  • High chlorine content: contains 65-70% available chlorine, making it a potent oxidizing agent
  • Solubility: easily soluble in water, producing a highly effective disinfecting solution
  • Stability: stable under normal conditions but decomposes slowly in moist environments, releasing chlorine gas
  • Form: available in granular, tablet, and powder forms

Usage guidelines

  • Dissolution: dissolve granules thoroughly in water before application to maximize disinfectant properties and avoid undissolved residues
  • Ventilation: use in a well-ventilated area to prevent inhalation of dust
  • Storage: store in a cool, dry place and handle with care to prevent decomposition
  • Regulatory compliance: ensure compliance with national and EU regulations regarding the use and disposal of calcium hypochlorite to protect environmental and public health

Safety precautions

  • Safe handling: always read the label and product information before use
  • Protective equipment: use gloves, safety goggles, and other protective gear to prevent skin and eye irritation
  • Reactive nature: handle with care; store away from organic materials and reducing agents to avoid hazardous reactions
  • Proper storage: keep in a cool, dry place to prevent moisture-induced chlorine gas release

Join us next week for another episode of in the ABC of water treatment, where we continue to share valuable insights and practical advice.