Key Features

Calcium hypochlorite 70% is a high‑strength chlorine‑based disinfectant widely used for effective pool water sanitation and shock chlorination. With a minimum of 70% available chlorine, it offers superior disinfection power compared to lower‑strength chlorine sources, rapidly eliminating bacteria, algae, viruses, and other harmful pathogens. The granular form dissolves readily in water, releasing hypochlorous acid—the active sanitizing species that ensures safe, clear, and hygienic pool water with residual protection between treatments.

Chemical Composition & Properties

Calcium hypochlorite 70% (chemical formula Ca(ClO)₂) appears as white or light gray granules or powder that are free‑flowing and highly soluble. It acts as a strong oxidizing agent, dissolving in both warm and cold water to produce hypochlorous acid and calcium hydroxide. Granules containing high available chlorine content provide rapid disinfection and are more stable with long shelf life when stored properly in cool, dry, and ventilated conditions.

Product Description

Calcium hypochlorite 70% for pool water is engineered to deliver fast and reliable sanitation by producing active chlorine species upon dissolution. These chlorine species penetrate microbial cell walls, oxidize organic contaminants, and prevent biological growth, making it ideal for both routine maintenance and shock treatments in residential, commercial, and public pools. Its high chlorine concentration means efficient microbial control with lower quantities of product.

Applications in Pool Water Treatment

Calcium hypochlorite 70% is commonly applied in swimming pool and spa sanitation, where it controls algae, bacteria, and organic waste while restoring water clarity after heavy use, rain, or contamination events. It is suitable for indoor and outdoor pools, water parks, and spa facilities. Additionally, it is used in emergency disinfection of drinking water and other water treatment scenarios requiring strong pathogen control.

Mechanism of Action

When calcium hypochlorite 70% granules dissolve in pool water, they release hypochlorous acid (HOCl), a highly reactive oxidizing agent that destroys pathogens by disrupting cell membranes, denaturing proteins, and inhibiting critical metabolic functions. This oxidation process also helps break down organic matter and maintain residual chlorine levels for ongoing protection against microbial regrowth.

Usage & Dosing Guidelines

Proper dosing of calcium hypochlorite 70% depends on pool size, water quality, and sanitation goals. For routine maintenance, adding measured doses of granular calcium hypochlorite helps maintain recommended free chlorine levels, often monitored in ppm. For shock chlorination, higher doses are used to quickly elevate available chlorine levels after heavy pool use or visible contaminants. It is recommended to pre‑dissolve granular product in a bucket of water before adding to the pool to ensure even distribution and avoid localized high concentrations.

Benefits

Calcium hypochlorite 70% offers rapid and powerful disinfection with strong oxidation capacity that effectively eliminates a broad spectrum of microorganisms. The high chlorine content reduces the amount of chemical needed compared to lower concentration products, providing cost‑effective and efficient sanitation. Its granular form is easy to handle, store, and dose, with stable performance and long shelf life when stored under suitable conditions.

Safety Considerations

Handling calcium hypochlorite 70% requires proper personal protective equipment such as gloves and eye protection to prevent irritation from dust and chemical exposure. Avoid mixing with acids, ammonia, or other incompatible chemicals, as this can produce toxic gases or hazardous reactions. Ensure good ventilation when handling and avoid inhaling dust. Always follow product safety data sheets and manufacturer instructions for safe application.

Storage Instructions

Store calcium hypochlorite 70% in tightly sealed containers in a cool, dry, and well‑ventilated area away from moisture, heat, and direct sunlight to preserve available chlorine content and prevent degradation. Keep it separate from organic materials, acids, reducing agents, and combustible substances. Regularly inspect storage conditions and packaging integrity to ensure long‑term effectiveness and safety when used for pool water treatment.