Key Features

Calcium hypochlorite granular is a high-strength, free-flowing chlorine compound used for effective water disinfection and sanitation. It typically contains a high percentage of available chlorine — often around 65–68% — that dissolves quickly in water to release hypochlorous acid, a potent oxidizing agent that kills bacteria, viruses, algae, and other harmful microorganisms. Granular calcium hypochlorite is widely used for pool shock treatments, routine sanitization, and industrial water treatment applications.

Chemical Composition & Properties

The active ingredient in calcium hypochlorite granular is Ca(ClO)₂, which appears as white to off-white solid granules. These granules dissolve rapidly in water, releasing active chlorine species that provide powerful disinfection and oxidation. Unlike stabilized chlorine products, calcium hypochlorite granules are usually free of cyanuric acid, reducing the risk of over-stabilization in outdoor pool environments.

Product Description

Calcium hypochlorite granular products are designed to deliver fast and reliable sanitation by producing active chlorine when dissolved in water. The released hypochlorous acid penetrates microbial cell walls and disrupts vital functions, leading to rapid inactivation of pathogens. These granules not only disinfect water but also help oxidize organic contaminants that cause cloudiness and odors, restoring water clarity and quality.

Applications in Water Treatment

Granular calcium hypochlorite is widely used in swimming pools, spas, and hot tubs as a shock or routine sanitizer to control algae and bacteria and improve water clarity. It is also applied in municipal water purification, wastewater treatment, and industrial water systems where strong microbial control is required. In smaller water treatment plants, granular calcium hypochlorite can supplement or replace chlorine gas systems for effective disinfection.

Mechanism of Action

When calcium hypochlorite granules dissolve in water, they release hypochlorous acid (HOCl), a highly reactive disinfecting species that destroys microorganisms by disrupting cell membranes, oxidizing proteins, and interfering with metabolic functions. This oxidation process also breaks down organic impurities, improving water quality and maintaining a residual disinfectant level to inhibit microbial regrowth.

Usage & Dosing Guidelines

Proper dosing of calcium hypochlorite granular depends on the volume of water, water quality, and sanitation goals. For pool shock treatments, measured doses are typically added to achieve rapid chlorine elevation, while routine maintenance involves lower doses to maintain recommended free chlorine levels. It is often recommended to pre-dissolve granules in a separate container before adding to larger water bodies to ensure even distribution and minimize undissolved particles settling.

Benefits

Calcium hypochlorite granular offers high disinfection efficiency, rapid microbial kill, and strong oxidizing capacity. Its granular form is easy to handle and dose, and it provides reliable sanitation without the need for stabilizers like cyanuric acid. When stored properly in dry, cool conditions, it has a long shelf life and is more stable than some liquid chlorine alternatives. These features make it suitable for both residential and commercial water systems.

Safety Considerations

Handling calcium hypochlorite granular requires appropriate personal protective equipment such as gloves and eye protection to avoid irritation from dust and chemical exposure. It should never be mixed with acids, ammonia, or incompatible chemicals, as this can produce toxic gases or hazardous reactions. Adequate ventilation is important when handling granules to reduce the risk of inhalation or contact.

Storage Instructions

Store calcium hypochlorite granular in a cool, dry, and well-ventilated area away from moisture, heat, and direct sunlight. Keep containers tightly sealed and separate from organic materials, acids, and reducing agents to prevent degradation and unsafe reactions. Regularly inspect storage conditions to maintain long-term effectiveness and safety for future use.