Products
chlorine tablets
Description: Chlorine tablets
Shape: round tablet
Appearance: white or grey-white, bule or with blue spot
Package: 50kg drum, 45kg drum, 40kg drum, 25kg drum, 10kg drum, 5 kg drum, 1 kg drum, craft drum, Customized package also accepted.
Dangerous chemical? Yes.
Chlorine Tablets: Complete Guide for Water Treatment Applications
Chlorine tablets are among the most widely used water treatment chemicals worldwide, providing controlled, slow-release disinfection for swimming pools, drinking water systems, and industrial water treatment. As a specialized manufacturer with over 15 years of export experience, Everglory Industrial supplies premium chlorine tablets in three primary chemical formulations — TCCA, calcium hypochlorite, and SDIC (sodium dichloroisocyanurate) — to municipal, commercial, and industrial buyers across 60+ countries.
Types of Chlorine Tablets We Manufacture
Everglory Industrial produces three primary chemical formulations of chlorine tablets, each engineered for specific applications and water chemistry conditions:
1. Trichloroisocyanuric Acid (TCCA) Tablets
TCCA tablets contain 90% available chlorine — the highest concentration among stabilized chlorine products. The cyanuric acid stabilizer protects the chlorine from rapid UV degradation, making TCCA tablets ideal for outdoor swimming pools and water systems exposed to sunlight. TCCA tablets dissolve slowly and consistently, maintaining a stable chlorine residual over extended periods.
2. Calcium Hypochlorite (Cal Hypo) Tablets
Calcium hypochlorite tablets contain 65–70% available chlorine and are unstabilized, meaning they do not contain cyanuric acid. This makes them suitable for applications where chlorine stabilizer buildup is undesirable, such as indoor pools, drinking water treatment, and food processing sanitation. Cal Hypo tablets dissolve faster than TCCA and provide rapid disinfection.
3. Sodium Dichloroisocyanurate (SDIC) Tablets
SDIC tablets contain 56–60% available chlorine and are uniquely pH-neutral (pH 6.0–7.0 in 1% solution), making them the gentlest chlorine tablet option for water chemistry balance. Like TCCA, SDIC contains cyanuric acid stabilizer for UV protection, but it dissolves significantly faster — typically within minutes — making it ideal for rapid treatment of above-ground pools, spas, and applications where both stabilization and pH neutrality are required. SDIC is also widely manufactured in effervescent tablet form for drinking water purification and medical surface disinfection.
Available Tablet Specifications
| Parameter | TCCA 90 Tablets | Calcium Hypochlorite | SDIC Tablets |
|---|---|---|---|
| Available Chlorine | ≥ 90% | 65% – 70% | 56% – 60% |
| Chemical Formula | C₃Cl₃N₃O₃ | Ca(ClO)₂ | C₃Cl₂N₃NaO₃ |
| CAS Number | 87-90-1 | 7778-54-3 | 2893-78-9 |
| UN Number | 2468 | 2880 | 2465 |
| Tablet Weight | 20g, 50g, 100g, 200g | 20g, 50g, 100g, 200g | 20g, 50g, 100g, 200g |
| pH (1% solution) | 2.7 – 3.3 (acidic) | 10.0 – 11.0 (basic) | 6.0 – 7.0 (neutral) |
| Moisture | ≤ 0.5% | ≤ 3% – 10% | ≤ 2% |
| Dissolution Rate | Slow (stable residual) | Medium (fast action) | Fast (rapid dissolution) |
| Stabilizer (CYA) | Yes (~55%) | No | Yes (~57%) |
| Solubility (25°C) | 1.2 g / 100 mL | 21 g / 100 mL | 25 g / 100 mL |
How to Choose the Right Chlorine Tablet
Selecting the correct tablet type depends on your application, water chemistry, and operating environment. The following comparison helps buyers make an informed decision:
| Factor | TCCA 90 | Cal Hypo 70 | SDIC 56–60 |
|---|---|---|---|
| Best Application | Outdoor pools (UV exposure) | Indoor pools, drinking water, industrial | Spas, above-ground pools, pH-sensitive water |
| Chlorine Concentration | Highest (90%) | High (65–70%) | Moderate (56–60%) |
| pH Impact | Lowers pH (acidic) | Raises pH (basic) | Neutral — minimal pH shift |
| UV Protection | Yes (CYA stabilizer) | No | Yes (CYA stabilizer) |
| Dissolution Speed | Slowest (5–7 days) | Medium (3–5 days) | Fast (1–3 days) |
| Calcium Hardness | No effect | Increases | No effect |
| NSF 60 Certified | No | Yes | Available |
| Effervescent Form | No | No | Yes (for drinking water) |
Primary Applications
Swimming Pool Disinfection: The most common application for chlorine tablets. TCCA tablets are preferred for outdoor pools due to UV stabilization, while Cal Hypo tablets suit indoor pools where stabilizer buildup is a concern. SDIC tablets are ideal for above-ground pools, spas, and hot tubs where pH neutrality and fast dissolution are valued. Tablets are typically placed in floating dispensers or automatic chlorinators for controlled release.
Drinking Water Treatment: Calcium hypochlorite and SDIC tablets are both used for municipal water disinfection, well water treatment, and emergency water purification. SDIC effervescent tablets are especially popular for household and travel water purification — simply drop a tablet into a container of water and wait 30 minutes for effective disinfection. NSF/ANSI Standard 60 certification is available for drinking water grade products.
Industrial Water Treatment: Cooling tower water treatment, industrial process water disinfection, and wastewater treatment. Cal Hypo and TCCA tablet forms ensure precise dosing and safer handling compared to liquid chlorine or bulk powder.
Aquaculture & Agriculture: Fish pond disinfection, livestock drinking water treatment, and irrigation system sanitation. SDIC tablets are particularly valued in aquaculture due to their pH-neutral profile, which minimizes stress on aquatic life.
Medical & Surface Disinfection: SDIC tablets are widely used in hospitals, clinics, and food processing facilities for surface disinfection. The near-neutral pH reduces corrosion on stainless steel surfaces and equipment, while the stabilized chlorine provides reliable, long-lasting antimicrobial action.
Quality Assurance & Certifications
All chlorine tablets manufactured by Everglory Industrial undergo rigorous quality control testing at every production stage. Our manufacturing facility holds ISO 9001 certification, and each batch is tested for available chlorine content, dissolution rate, moisture content, and tablet hardness. SGS third-party inspection reports are available upon request.
- ISO 9001:2015 Quality Management System Certified
- NSF available for drinking water grade (Cal Hypo & SDIC)
- REACH registered for EU market compliance
- SGS batch testing and pre-shipment inspection
Packaging Options
We offer flexible packaging to meet diverse B2B requirements:
- Retail packaging: 1kg, 2kg, 5kg, 10kg plastic pails with tamper-evident lids
- Bulk packaging: 25kg, 45kg, 50kg fiber drums with inner PE liner
- Effervescent tablet tubes: SDIC effervescent tablets in sealed tubes or blister packs for retail water purification markets
- Custom packaging: Private label, custom weights, and branded packaging available
All packaging complies with international dangerous goods regulations (IMDG, IATA) for safe global shipping.
Storage & Safety
Store chlorine tablets in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and incompatible materials. Keep containers tightly sealed to prevent moisture absorption and chlorine degradation. Do not store near acids, ammonia, or organic materials, as dangerous reactions may occur. Never mix different chlorine types (TCCA, Cal Hypo, SDIC) in the same container or chlorinator — doing so can cause violent chemical reactions, heat generation, and toxic gas release. Shelf life is 24 months for TCCA and 12–18 months for Cal Hypo and SDIC when stored properly.
Frequently Asked Questions
Q: What is the difference between TCCA, calcium hypochlorite, and SDIC tablets?
TCCA tablets contain 90% available chlorine with CYA stabilizer — ideal for outdoor pools. Calcium hypochlorite tablets contain 65–70% chlorine with no stabilizer — best for indoor pools and drinking water. SDIC tablets contain 56–60% chlorine with stabilizer and a near-neutral pH (6.0–7.0) — ideal for spas, above-ground pools, and applications where pH balance is critical.
Q: Why choose SDIC tablets over TCCA tablets?
SDIC tablets offer two key advantages over TCCA: (1) near-neutral pH (6.0–7.0 vs. TCCA's 2.7–3.3), which minimizes impact on water pH and reduces the need for pH adjustment chemicals; and (2) faster dissolution, providing quicker chlorine availability. SDIC is preferred for spas, above-ground pools, aquaculture, and medical surface disinfection. TCCA remains better for large outdoor pools needing long-lasting, slow-release chlorination.
Q: Can SDIC tablets be used for drinking water purification?
Yes. SDIC is widely formulated as effervescent tablets (typically 8.5mg, 17mg, 33mg, 67mg, or 167mg sizes) for household, travel, and emergency drinking water purification. One 67mg SDIC effervescent tablet can disinfect 15–20 liters of clear water in 30 minutes. NSF/ANSI 60 certified SDIC is available for municipal and institutional applications.
Q: Can I mix different types of chlorine tablets in the same chlorinator?
Never mix TCCA, calcium hypochlorite, or SDIC tablets together. Mixing different chlorine compounds can cause dangerous chemical reactions, including heat generation, fire, and toxic gas release. Always fully clean and dry equipment before switching chlorine types.
Q: Which tablet size should I choose?
Tablet size depends on your application and dosing system. For residential pools, 20g or 50g tablets are common. For commercial pools and water treatment, 100g or 200g tablets provide longer-lasting treatment and reduced maintenance frequency. SDIC effervescent tablets for drinking water come in small, precise doses (8.5mg–167mg). We can also produce custom sizes upon request.
Q: What is the minimum order quantity (MOQ)?
Our standard MOQ is 1 metric ton (1,000 kg) per product type. For trial orders, we can accommodate smaller quantities — please contact our sales team to discuss your specific requirements.
