200g Chlorine Tablets — Slow-Dissolving 3-Inch Calcium Hypochlorite

200g chlorine tablets are the industry-standard slow-dissolving calcium hypochlorite format for sustained chlorine release in swimming pools, commercial aquatic facilities, and industrial water treatment systems. Each tablet weighs exactly 200 grams and measures approximately 76mm (3 inches) in diameter, containing 65-70% available chlorine pressed from high-purity calcium hypochlorite under precisely controlled compaction pressure. The defining characteristic of 200g chlorine tablets is their controlled dissolution profile: a single tablet placed in a pool skimmer or floating dispenser dissolves gradually over 2 to 7 days, maintaining consistent free chlorine residuals without the daily manual dosing required by granular chlorine. Everglory Industrial manufactures and exports these 3-inch tablets to B2B buyers in 60+ countries, with full UN 2880 certified plastic drum packaging and ISO 9001 quality system compliance.

200g Chlorine Tablet Specifications

The following specifications are verified on every production batch of 200g chlorine tablets and documented in the Certificate of Analysis that accompanies each shipment:

Slow-Dissolving Mechanism of 200g Tablets

The controlled dissolution of 200g chlorine tablets is achieved through a combination of tablet geometry, compaction density, and the chemical properties of calcium hypochlorite. Understanding this mechanism helps B2B buyers and end-users optimize tablet placement and dosing for their specific application.

During manufacturing, high-purity calcium hypochlorite granular is fed into a precision tablet press die cavity and compressed at forces of 80 to 150 kilonewtons. This compaction creates a tablet of uniform density throughout its cross-section, with minimal internal voids or density gradients. When the tablet is submerged in water, dissolution occurs only at the surface boundary layer, where water molecules contact the calcium hypochlorite crystal structure. Because the tablet is large (76mm diameter, 200g mass) and highly compacted, the surface-area-to-volume ratio is low, limiting the rate at which water can penetrate and dissolve the interior material.

Several factors influence the dissolution rate of 200g chlorine tablets in field conditions:

• Water temperature: Dissolution rate approximately doubles for every 10 degrees C increase in water temperature. At 15 degrees C, a 200g tablet may last 7 days; at 30 degrees C, the same tablet may dissolve in 3 to 4 days
• Water flow rate: Tablets placed in a skimmer with high pump flow dissolve faster than those in a static floating dispenser. Flow continuously refreshes the dissolution boundary layer, accelerating chlorine release
• Water pH: Lower pH (acidic water) accelerates dissolution slightly, while higher pH (alkaline water) slows it. Maintaining pH between 7.2 and 7.6 ensures consistent dissolution behavior
• Dispenser ventilation: Floating dispensers with adjustable ventilation slots allow control of dissolution rate. Opening the slots increases water contact and speeds release; closing them slows it for extended maintenance intervals

Dissolution Timeline

The following table illustrates the typical chlorine release profile of a single 200g chlorine tablet in a pool skimmer at 25 degrees C with moderate flow. Actual release rates vary based on the factors described above:

For best results, replace the 200g chlorine tablet before it fully dissolves to avoid a gap in chlorine coverage. Many pool service technicians add a new tablet when the previous one is approximately 20% of its original size, ensuring continuous sanitizer residual without interruption.

Applications of 200g Chlorine Tablets

The sustained-release dissolution profile and substantial 200g mass of these 3-inch tablets make them the dominant chlorine format for medium to large water volumes where multi-day maintenance intervals are required:

• Residential swimming pools: The largest single application for 200g chlorine tablets. Homeowners place 1 to 2 tablets in the skimmer basket or floating dispenser, replacing them every 5 to 7 days. This eliminates daily chlorine testing and dosing, reducing pool maintenance to a weekly task while maintaining consistent 1 to 3 mg/L free chlorine residuals
• Commercial swimming pools: Hotels, resorts, schools, and public pools use inline erosion chlorinators loaded with 200g tablets for automated continuous dosing. The tablet size and dissolution rate are optimized for commercial feeder chambers, providing 24-hour chlorine coverage with refill intervals of 3 to 7 days depending on bather load
• Cooling tower water treatment: Industrial HVAC cooling towers use 200g tablet erosion systems for continuous biocide dosing to control Legionella bacteria, biofilm, and slime formation. The slow-release profile maintains a steady oxidant residual in the recirculating cooling water without the sharp concentration spikes associated with liquid or granular dosing
• Rural community water systems: Small-town and village water supplies use 200g tablet chlorinators for simple, low-maintenance disinfection of distributed drinking water. The tablets require no electricity, pumps, or day tanks, making them ideal for remote installations where liquid chlorine gas or sodium hypochlorite dosing systems are impractical
• Decorative fountains and ponds: Large ornamental water features in commercial plazas, hotel lobbies, and public parks use 200g tablets in submerged dispensers to control algae and bacterial growth. The slow dissolution minimizes maintenance visits while keeping water clarity and hygiene at acceptable standards

200g Chlorine Tablets Dosing Guide

The following dosing guide provides general recommendations for 200g chlorine tablets across a range of pool volumes. Actual dosage depends on water temperature, bather load, sunlight exposure, and chlorine demand. Always verify free chlorine residual with a test kit and adjust accordingly:

For commercial pools with high bather loads, an inline erosion feeder loaded with multiple 200g chlorine tablets provides the most reliable dosing method. The feeder automatically dissolves tablets as water flows through the chamber, maintaining a consistent chlorine residual. Check feeder tablet levels weekly and refill as needed.

Packaging and Storage

All 200g chlorine tablets are packed exclusively in UN 2880 certified plastic drums with inner PE liners, ensuring full compliance with IMDG code for maritime shipping of Class 5.1 oxidizing substances. The table below shows tablet counts per drum size:

Store 200g chlorine tablets in the original sealed plastic drum in a cool, dry, well-ventilated area at temperatures below 30 degrees C. Keep away from direct sunlight, heat sources, acids, ammonia, and combustible organic materials. Never store near or mix with trichlor (TCCA) products, as mixing different chlorine compounds can cause violent chemical reactions. Do not stack drums more than three layers high. Shelf life is 24 months from the manufacturing date. Once opened, reseal the drum tightly after each use to prevent moisture absorption and chlorine degradation.

Frequently Asked Questions