Calcium Hypochlorite Tablets — Slow-Dissolving & Rapid Chlorine Sanitization

Calcium hypochlorite tablets are a compact, pre-measured, and convenient solid chlorine form designed for sustained-release and controlled-dose water disinfection applications. Unlike granular chlorine, which dissolves rapidly and is best suited for shock treatment, calcium hypochlorite tablets dissolve gradually, releasing chlorine over hours or days to maintain consistent sanitizer residuals with minimal manual intervention. Everglory Industrial manufactures and exports premium-grade calcium hypochlorite tablets in two standard sizes — 3-inch (200g) slow-dissolving and 1-inch (20g) rapid-dissolving — to B2B buyers across 60+ countries. Our tablets contain a minimum of 65-70% available chlorine and are pressed from high-purity calcium hypochlorite under controlled compaction pressure to ensure uniform dissolution rates and consistent chlorine release profiles.

Calcium Hypochlorite Tablets vs Granular: Key Differences

Both granular and tablet forms contain the same active ingredient — calcium hypochlorite — but their physical form creates distinct performance characteristics that suit different operational scenarios. Understanding these differences helps B2B buyers select the right product for each application:

Available Tablet Sizes and Specifications

Everglory Industrial produces calcium hypochlorite tablets in two standard sizes, each engineered for specific dissolution profiles and application requirements:

All calcium hypochlorite tablets are manufactured from the same high-purity calcium hypochlorite as our granular grade, ensuring identical chlorine content and quality standards. The compaction process uses mechanical tablet presses without chemical binders that could introduce contaminants or reduce chlorine availability. Each batch is tested for tablet hardness, friability, and dissolution rate before shipment.

Applications of Calcium Hypochlorite Tablets

The controlled dissolution profile of calcium hypochlorite tablets makes them the preferred choice for applications where consistent chlorine residual maintenance is more important than rapid chlorine elevation:

• Swimming pool maintenance: 3-inch tablets placed in skimmers, floating dispensers, or automatic erosion feeders provide continuous chlorine release for 2-7 days, maintaining stable free chlorine residuals without daily manual dosing — the largest application segment for calcium hypochlorite tablets globally
• Commercial pool and spa facilities: Hotels, resorts, and public swimming facilities use tablet erosion feeder systems for automated chlorine dosing, reducing labor costs and ensuring consistent water quality compliance with health regulations
• Drinking water treatment (rural and small systems): 1-inch tablets are used in small-community water systems and point-of-use treatment devices where controlled chlorine release is needed for remote locations without dosing pump infrastructure
• Emergency and humanitarian water purification: 1-inch (20g) tablets are ideal for field use by NGOs, military units, and disaster response teams — individually packaged, pre-measured, and easy to distribute for rapid water purification in crisis situations
• Cooling tower water treatment: Tablet erosion systems provide continuous biocide dosing for industrial cooling water systems, preventing Legionella and biofilm formation in HVAC and process cooling circuits
• Aquaculture and hatchery systems: Controlled-release tablets maintain residual chlorine levels in fish and shrimp farming water treatment without the spikes associated with granular dosing

How to Use Calcium Hypochlorite Tablets

Proper use of calcium hypochlorite tablets depends on the application and equipment available. Below are general usage guidelines for the most common B2B scenarios:

• Pool skimmer method (3-inch tablets): Place 1-2 tablets directly into the pool skimmer basket. Water flow dissolves the tablet gradually, distributing chlorinated water throughout the pool via the return jets. Replace when the tablet is fully dissolved. Typical dosage: 1 tablet (200g) per 50,000 L of pool water, maintaining 1-3 mg/L free chlorine residual
• Floating dispenser method (3-inch tablets): Load 1-3 tablets into a floating chlorine dispenser and adjust the ventilation slots to control dissolution rate. The dispenser floats on the pool surface, releasing chlorine evenly. Ideal for pools without skimmer systems
• Automatic erosion feeder (3-inch tablets): Commercial pools use inline erosion chlorinators where water passes through a chamber containing tablets. The feeder maintains precise chlorine levels automatically and is the preferred method for hotels, public pools, and large aquatic facilities
• Emergency water treatment (1-inch tablets): Dissolve 1 tablet (20g) in 200 L of water to achieve approximately 0.2-0.5 mg/L free chlorine residual for potable water. Allow 30 minutes contact time before consumption. Always use a clean container and verify residual chlorine with a test kit
• Surface disinfection solution (1-inch tablets): Dissolve 1 tablet (20g) in 2 L of water to prepare a high-strength disinfectant solution (approximately 5,000-7,000 mg/L available chlorine) for surface sanitation in food processing, agricultural, and industrial environments

Important safety note: Never place calcium hypochlorite tablets directly into the pool without a skimmer, dispenser, or feeder. Direct contact with pool surfaces can cause bleaching and damage. Never mix tablets with acid, ammonia, or other pool chemicals. Always store tablets in their original sealed drum and handle with appropriate PPE including gloves and eye protection.

Packaging and Storage

Calcium hypochlorite tablets are classified as UN 2880 (Class 5.1 Oxidizer) and require certified dangerous goods packaging for international transport. Everglory Industrial packs all tablet shipments exclusively in UN 2880 certified plastic drums with inner PE liners, ensuring full compliance with IMDG code requirements for maritime shipping. Available drum sizes include:

For storage, keep calcium hypochlorite tablets in the original sealed drum in a cool, dry, well-ventilated area away from direct sunlight, heat sources, acids, and combustible organic materials. Do not stack drums more than three layers high. Under proper storage conditions, shelf life is 24 months from the manufacturing date. Once a drum is opened, reseal tightly after each use to prevent moisture absorption, which can cause tablets to soften and release chlorine gas.

Why Source Calcium Hypochlorite Tablets from Everglory Industrial

• Factory-direct manufacturing: We operate our own tablet compaction facility with precision mechanical presses, ensuring consistent tablet weight, hardness, and dissolution rate across every production batch
• ISO 9001 quality system: Every batch of calcium hypochlorite tablets is tested for available chlorine content, tablet hardness, friability, and dissolution profile before shipment, with a Certificate of Analysis provided for each order
• No chemical binders: Our tablets are pressed without binders or fillers that could reduce chlorine availability or introduce contaminants — 100% active calcium hypochlorite
• OEM private label service: Custom branding with your company name, logo, and contact information on drum labels. Custom tablet packaging configurations and individual tablet wrapping available for retail distribution clients
• Complete export documentation: Commercial Invoice, Packing List, COO, MSDS (in English, French, or Spanish), COA, Bill of Lading, and DG declaration — all prepared in-house for smooth customs clearance at your destination port
• Global export experience: Regular shipments to 60+ countries across Africa, Latin America, the Middle East, and Southeast Asia — we understand DG shipping regulations and customs requirements for all major destination ports

Frequently Asked Questions