Products
Chlorine Granules for pool
Description: Chlorine Granules for pool
Exact products include: Cal Hypo, Trichlor(TCCA), Dichlor(SDIC chemical), BCDMH and Chlorine dioxide.
Colour: white or grey-white
Form:granules
Package: round drum, square drum, customized package is accepted.
Hazardous :yes
Pool Chlorine Granules — Fast-Acting Shock & Daily Sanitizer
Pool chlorine granules provide rapid, flexible disinfection that tablet formulations cannot match. Whether you need to shock-treat a green pool, boost chlorine levels before a pool party, or maintain daily sanitizer residuals, granular chlorine delivers immediate results. Everglory Industrial manufactures premium pool chlorine granules in multiple chemical formulations, particle sizes, and packaging options for pool service companies, distributors, and retailers worldwide.
Chlorine granules for pool are the general name of chlorine-containing disinfectant. Chlorine-containing disinfectants refer to disinfectants that dissolve in water to produce hypochlorous acid with microbicidal activity. Its microbicidal active ingredients are often expressed as available chlorine. Including 84 disinfectant, bleaching powder/water, chlorine-containing disinfectant powder or chlorine-containing effervescent tablets, etc.
Hypochlorous acid has a small molecular weight and can easily diffuse to the surface of bacteria and penetrate the cell membrane into the bacteria, oxidizing bacterial proteins and causing bacterial death. Chlorine-containing disinfectants can kill a variety of microorganisms, including bacterial propagules, viruses, fungi, tuberculosis bacilli and the most resistant bacterial spores. Such disinfectants include inorganic chlorine compounds (such as sodium hypochlorite, calcium hypochlorite, trisodium chloride phosphate), organic chlorine compounds (such as sodium dichloroisocyanurate, trichloroisocyanuric acid, etc.). Inorganic chlorine is unstable and is easily affected by light, heat and moisture, and loses its active ingredients. Organic chlorine is relatively stable, but is unstable when dissolved in water.
Advantages of Granular Chlorine for Pools
While tablets are ideal for maintenance dosing, granular chlorine serves critical functions that tablets cannot:
- Instant dissolution: Granules dissolve within minutes, raising free chlorine levels immediately — essential for shock treatment
- Flexible dosing: Adjust dosage precisely based on current chlorine levels, pool volume, and contamination severity
- Spot treatment: Apply directly to problem areas (algae blooms, debris contamination) for targeted treatment
- No dispenser required: Granules can be broadcast directly into the pool, eliminating chlorinator dependency
- Cost-effective shock: Lower cost per treatment compared to liquid shock chlorine
Pool Chlorine Granule Formulations
1. Calcium Hypochlorite Granules (Cal Hypo) — 65–70%
The most popular granular chlorine for pool shock treatment in North America. Cal Hypo granules dissolve quickly, deliver 65–70% available chlorine, and are unstabilized — meaning they provide full-strength chlorination without adding cyanuric acid. Ideal for weekly shock treatment, algae remediation, and indoor pool maintenance.
| Specification | Value |
|---|---|
| Available Chlorine | ≥ 70% |
| Particle Size | 8–30 mesh (granular) |
| pH (1% solution) | 10.0 – 11.0 |
| Dissolution Time | 5–10 minutes (with circulation) |
| CAS Number | 7778-54-3 |
| UN Number | 2880 (Class 5.1) |
| Stabilizer | None |
2. TCCA 90 Granules — 90% Available Chlorine
TCCA granules offer the highest chlorine concentration in stabilized form. The built-in cyanuric acid protects chlorine from UV degradation, making TCCA granules ideal for outdoor pool shock treatment and daily maintenance in sunny climates. Dissolves slightly slower than Cal Hypo but provides longer-lasting residual.
| Specification | Value |
|---|---|
| Available Chlorine | ≥ 90% |
| Particle Size | 8–30 mesh |
| pH (1% solution) | 2.7 – 3.3 |
| Dissolution Time | 10–15 minutes (with circulation) |
| CAS Number | 87-90-1 |
| UN Number | 2468 (Class 5.1) |
| Stabilizer (CYA) | ~55% |
3. Sodium Dichloroisocyanurate (SDIC) Granules — 56% / 60%
SDIC granules are pH-neutral (6.0–7.0), making them the gentlest option for pool water chemistry. They dissolve rapidly and contain cyanuric acid stabilizer. Popular for spa treatment, above-ground pools, and applications where pH balance is critical.
4. Others:
Bromochlorohydantoin(BCDMH), Chlorine dioxide
All of them can have granules shape.
Size of Chlorine granules for pool:
The popular size is 8-30 mesh, 20-40 mesh. Please feel free to contact us if you have special requirement about size of chlorine granules for pool.
How to Use Pool Chlorine Granules
Daily/Weekly Maintenance Dosing
For routine pool sanitization, add granular chlorine to maintain 1–3 ppm free chlorine:
| Pool Volume | Cal Hypo 70% (per dose) | TCCA 90% (per dose) |
|---|---|---|
| 10,000 gal (38 m³) | 100–150g | 50–80g |
| 20,000 gal (76 m³) | 200–300g | 100–160g |
| 40,000 gal (151 m³) | 400–600g | 200–320g |
Shock Treatment Dosing
For shock chlorination (superchlorination), apply 5–10x the normal maintenance dose to raise free chlorine to 10+ ppm:
| Pool Volume | Cal Hypo 70% (shock dose) | TCCA 90% (shock dose) |
|---|---|---|
| 10,000 gal (38 m³) | 500–700g | 250–400g |
| 20,000 gal (76 m³) | 1,000–1,400g | 500–800g |
| 40,000 gal (151 m³) | 2,000–2,800g | 1,000–1,600g |
Application Method
- Test water: Check pH (adjust to 7.2–7.6 before shocking) and current free chlorine level
- Pre-dissolve (recommended): Dissolve granules in a clean bucket of pool water, then distribute around the pool perimeter. This prevents bleaching of pool surfaces and ensures even distribution
- Direct broadcast (alternative): With pump running, broadcast granules directly into the pool, concentrating on deep-end areas. Avoid windy conditions
- Run pump: Circulate water for at least 1–2 hours after application
- Wait before swimming: Do not re-enter pool until free chlorine drops below 5 ppm (typically 4–8 hours for maintenance dose, 12–24 hours for shock dose)
Cal Hypo vs. TCCA Granules for Pool Use
| Factor | Cal Hypo 70% | TCCA 90% |
|---|---|---|
| Chlorine Content | 70% | 90% |
| Dissolution Speed | Faster (5–10 min) | Slower (10–15 min) |
| UV Protection | No | Yes (CYA stabilizer) |
| Best For | Shock treatment, indoor pools | Outdoor pools, daily maintenance |
| pH Impact | Raises pH | Lowers pH |
| Calcium Hardness | Increases | No effect |
| Cost per Treatment | Lower (more product needed) | Higher (less product needed) |
Packaging Options
- Bulk: 25kg / 45kg / 50kg fiber drums or plastic drums with inner liner
- Retail: 1kg, 2kg, 5kg, 10kg, 22.7kg (50 lb) pails and bags
- Private label: Custom branded packaging with multilingual labels
- Water-soluble pouches: Pre-measured doses in PVA film for convenient dosing (custom order)
Safety Precautions
Pool chlorine granules are strong oxidizers. Always add granules to water — never water to granules. Wear safety goggles and gloves when handling. Do not mix with other chemicals, especially acids, ammonia, or TCCA products. Store in original sealed containers in a cool, dry place away from combustible materials.
Frequently Asked Questions
Q: Can I use chlorine granules instead of tablets?
Yes, but they serve different purposes. Granules are best for shock treatment and rapid chlorine boosts, while tablets provide slow, consistent daily sanitization. Most pool professionals use both: tablets for maintenance and granules for weekly shocking and problem remediation.
Q: Can I put chlorine granules directly in the skimmer?
No. Never put granular chlorine in the skimmer. Concentrated chlorine can damage the pump, filter, and heater components. Always dissolve granules in a bucket first, or broadcast directly into the pool water with the pump running.
Q: How soon can I swim after adding chlorine granules?
For maintenance dosing (1–3 ppm), wait at least 1–2 hours with the pump running. For shock treatment (5–10+ ppm), wait 8–24 hours until free chlorine levels drop below 5 ppm. Always test the water before re-entering the pool.
Q: What is the difference between chlorine granules and pool shock?
"Pool shock" is simply a high dose of chlorine (or non-chlorine oxidizer) applied to eliminate contaminants. Chlorine granules — particularly calcium hypochlorite 70% — are the most common chemical used for shock treatment. The terms are often used interchangeably, though "shock" can also refer to potassium monopersulfate (non-chlorine shock) products.
Q: Do you supply water-soluble pouch packaging?
Yes, we manufacture pre-measured granular chlorine in PVA water-soluble film pouches. These dissolve completely in pool water, eliminating measuring and handling. Available in 15g, 30g, 100g, and 200g pre-measured pouches. Ideal for retail pool care brands. MOQ for water-soluble pouches is typically 3 tons.
Application:
Calcium hypochlorite: Many people call it bleach powder, it means that it can be used as bleach in pulp and paper making industry and as the bleaching in the dyeing and textile industry.
Another main use is as disinfectant in water treament including drinking water, swimming pool, aquaculture and animal husbandry etc.
It is also used in the mining-elution process which involves the stripping of metals.
Sodium dichloroisocyanurate: Sodium dichloroisocyanurate, also known as Euchlorine, molecular formula: (C3C12N3O3)Na, referred to as SDIC, is a widely used organochlorine disinfectant, containing 60% to 64.5% of available chlorine, with high efficiency, It has the advantages of broad spectrum, stability, high solubility and low toxicity. The aqueous solution can be used for spraying, soaking, and wiping. It can also be used to directly disinfect pollutants and treat feces and other excreta. The usage is the same as bleaching powder. Mix it with paraformaldehyde dry powder and ignite it, and the gas can be fumigated and sterilized. It can also be mixed with No. 92 coagulant (synthesized based on aluminum hydroxychloride plus iron powder, sulfuric acid, hydrogen peroxide, etc.) at a ratio of 1:4 to form "clear water", which can be used for drinking water disinfection. It can also be formulated with sodium nitrate to form various disinfectant detergents, such as Dijingmei, Youchlorjing, etc. It can quickly kill viruses, bacteria and their spores, and can effectively prevent hepatitis and other infectious diseases.
Trichloroisocyanuric acid: Trichloroisocyanuric acid is commonly known as strong chlorine. Its molecular formula is C3N3O3Cl3, or TCCA for short name. It is a chlorinated derivative of isocyanuric acid. Its effective chlorine content is as high as 90%. It is mainly in the form of granules and flakes and has very high bactericidal ability. powerful. Advantage:Trichloroisocyanuric acid is a highly efficient, low-toxic, broad-spectrum, and rapid sterilizing and disinfectant promoted internationally. It can effectively and quickly kill various bacteria, fungi, spores, molds, and cholera isolates. It has special effects on killing hepatitis A and hepatitis B viruses, and also has a good disinfection effect on sexual viruses and HIV.
Bromochlorohydantoin(BCDMH): Bromochlorohydantoin is commonly known as bromine tablets (English abbreviation BCDMH), molecular formula: C5H6BrClN2O2. Its active ingredients contain chlorine and bromine, which are generally crystalline powders and white tablets. Bromine preparations are more stable than chlorine preparations, have a milder smell, and are not as sensitive to pH changes as chlorine.
Chlorine dioxide:
The molecular formula is ClO2, which is a yellow-green gas with a pungent odor and is easily volatile. At -5~95°C, the quality is stable and not easy to decompose. It can be activated after adding acid to produce free chlorine dioxide. It is not a chlorine-containing disinfectant, but is actually a peroxide-based disinfectant. Advantages: Chlorine dioxide has a strong oxidizing effect and can oxidize and decompose the amino acids in microbial proteins, leading to amino acid breakage and protein decomposition, thus causing the death of microorganisms. It is a highly effective disinfectant that can kill various microorganisms, including bacterial propagules, spores, fungi, viruses, and even protozoa. Disinfection is fast and long-lasting, with few disinfection by-products, effective killing and water quality control effects, wide application pH range, wide applicable water quality range, and strong ability to oxidize organic matter.
