Algae and bacteria control is one of the most fundamental challenges in water treatment, crucial in various applications including swimming pools, drinking water systems, aquaculture ponds, industrial circulating water systems, and emergency disinfection scenarios. Chlorine-based disinfectants remain the most widely used and cost-effective solution for algae and bacteria control. Among these, Sodium Dichloroisocyanurate (SDIC) stands out due to its excellent balance of disinfection efficiency, stability, safety, and ease of use. As a highly reliable disinfectant with potent inhibitory effects on both algae and bacteria, SDIC is increasingly favored by water treatment professionals, swimming pool operators, municipal authorities, and industrial users.
As a professional NaDCC manufacturer and direct supplier, we understand that our customers value not only product performance but also supply stability, consistent quality, and long-term technical reliability. This article provides a comprehensive analysis of SDIC's inhibitory effects on algae and bacteria, from its chemical mechanisms to practical applications, and emphasizes the importance of choosing a stable and experienced SDIC manufacturer for large-scale, long-term water treatment projects.
What is Sodium Dichloroisocyanurate?
Sodium dichloroisocyanurate (SDIC, NaDCC) is a chlorine-releasing disinfectant widely used in water treatment and sanitation. In many international markets, sodium dichloroisocyanurate is also known as Troclosene Sodium, particularly in the medical, pharmaceutical, and emergency disinfection sectors. Chemically, NaDCC is a stable organic chlorine compound containing active chlorine released in a controlled manner.
Compared to traditional inorganic chlorine disinfectants, NaDCC offers the following advantages:
- Higher stability during storage and transportation
- Lower chlorine loss
- Easier handling and dosing
- More controlled and sustained chlorine release
- Reduced risk of hazardous reactions
These advantages make NaDCC a preferred disinfectant for modern water treatment systems.
Chemical Properties of NaDCC
The molecular formula of sodium dichloroisocyanurate is: C3Cl2N3NaO3
When dissolved in water, NaDCC releases hypochlorous acid (HOCl), which is the main active disinfectant, capable of killing bacteria and inhibiting algae growth.
Key chemical characteristics include:
- Rapid dissolution rate
- Strong oxidizing ability
- Broad-spectrum antibacterial activity
- Stability and ease of storage
SDIC remains stable even under long-term storage conditions, making it particularly suitable for:
- Bulk storage
- Export transportation
- Emergency disinfection reserves
- Water treatment in remote areas
For factory direct suppliers and large distributors, this stability directly translates into lower logistical risks and longer shelf life.
Mechanism of Action: How NaDCC Releases Active Chlorine
When NaDCC comes into contact with water, a hydrolysis reaction occurs, producing hypochlorous acid, hypochlorite ions, and cyanuric acid.
Hypochlorous acid is a highly reactive oxidizing agent that can penetrate microbial cell walls and cause damage to:
- Cell membranes
- Enzyme systems
- DNA and RNA structures
This leads to the rapid inactivation and death of bacteria, viruses, and algae cells.
Cyanuric acid, on the other hand, combines with free chlorine, preventing the chlorine from being rapidly decomposed by sunlight. Cyanuric acid is known as a chlorine stabilizer. NaDCC is also called stabilized chlorine.
Compared to other chlorine-containing disinfectants, NaDCC dissolves more quickly and ensures more stable residual chlorine levels.
This property is particularly important for:
- Swimming pool water
- Industrial cooling systems
- Aquaculture ponds
- Drinking water storage
NaDCC Antibacterial Mechanism
The hypochlorous acid (HOCl) released when sodium dichloroisocyanurate (NaDCC) dissolves in water is the main component that inhibits bacterial growth.
The Mechanism Includes:
Oxidative damage to bacterial enzymes: HOCl reacts with proteins, denaturing the enzymes necessary for bacterial metabolism.
Cell membrane disruption: Oxidation damages the bacterial cell wall, leading to leakage of intracellular components.
DNA and RNA damage: HOCl alters nucleic acids, preventing replication and leading to cell death.
Compared to other chlorine disinfectants, NaDCC provides controlled and sustained release of chlorine, ensuring long-term inhibition of bacterial growth in industrial water, aquaculture, and swimming pools.
The Inhibitory Effect of Sodium Dichloroisocyanurate on Algae
Algae control is crucial for aquatic systems, preventing biofouling, oxygen depletion, and water quality issues. Sodium dichloroisocyanurate effectively inhibits algae through the following mechanisms:
Oxidative stress on algal cells: Hypochlorous acid penetrates the cell wall, leading to cell lysis.
Disruption of photosynthesis: Hypochlorous acid interferes with chlorophyll and energy production.
Prevention of biofilm formation: Inhibits algae from forming a protective layer that harbors bacteria.
NaDCC ensures sustained anti-algal activity, reducing the frequency of application compared to other rapidly dissolving chlorine sources.
Sodium Dichloroisocyanurate (SDIC) in Swimming Pool Applications
SDIC is widely used for algae and bacteria control in swimming pools, offering the following benefits:
- Rapidly reduces bacterial counts to maintain safe water quality.
- Prevents algae growth, ensuring clear and aesthetically pleasing water.
- Flexible formulations: granules and tablets.
- Reduces chlorine loss under UV irradiation.
- Fast dissolution rate, suitable for pool shock treatment.
NaDCC for Drinking Water and Emergency Disinfection
Sodium dichloroisocyanurate is also an ideal choice for drinking water treatment and emergency disinfection because:
- It has broad-spectrum antimicrobial activity against bacteria, viruses, and protozoa.
- It has a stable shelf life during storage and transportation.
- Its compact and convenient packaging makes it suitable for emergency kits, hiking, or disaster relief.
The NaDCC factory strictly controls quality, ensuring stable disinfection effectiveness even under harsh conditions.
Applications of SDIC in Aquaculture and Industrial Water Treatment
In aquaculture ponds, SDIC provides:
- Effective bacterial control to prevent fish diseases
- Inhibition of algae growth to maintain oxygen balance and water clarity
- Reduction of biofilm to prevent microbial contamination
In industrial water systems, SDIC ensures:
- Prevention of microbial fouling and corrosion
- Continuous residual chlorine in cooling towers and circulating systems
- Stable disinfection performance, reducing maintenance costs
SDIC features broad-spectrum activity, good stability, and sustained release, making it ideal for complex water treatment scenarios.
Recommended Dosage of SDIC for Algae and Bacteria Control
The effective dosage of SDIC depends on water type, microbial load, and intended application:
|
Application |
Typical Dosage |
Notes |
| Swimming Pools | 2–5.5 g/m³ (granules) | Adjust based on residual chlorine measurement; maintain 1–3 ppm free chlorine |
| Drinking Water | 5–10 mg/L | Dissolve thoroughly; ensure at least 30 minutes contact time |
| Aquaculture Ponds | 0.15–0.225 ppm | Monitor fish health; avoid overdose to prevent stress |
| Industrial Circulation Water | 2–4 ppm | Maintain residual chlorine; repeat dosing every 2–3 days depending on organic load |
Key Tips for Effective SDIC Use:
- Pre-dissolve granules or tablets for uniform distribution.
- Measure chlorine residual using a reliable test kit.
- Adjust dosage according to water pH and temperature.
- Avoid combining with incompatible chemicals (acids, ammonia, reducing agents).
Factors Affecting the Efficiency of Sodium Dichloroisocyanurate (SDIC)
Several environmental and water quality factors can affect the disinfection and algae inhibition efficiency of SDIC:
Water pH:
The optimal pH for disinfection is 6.5-7.5. High pH values reduce the effectiveness of free hypochlorous acid.
Water Temperature:
Increased temperature accelerates chlorine activity, but may also lead to increased chlorine loss.
Organic Load:
High concentrations of dirt, grease, or organic matter will consume chlorine, reducing the effectiveness of SDIC.
Water Hardness and Alkalinity:
Water with extremely high hardness or alkalinity may require higher dosages to achieve the same disinfection effect.
By understanding these factors, operators can optimize the dosage of SDIC to maximize the inhibition of algae and bacterial growth.
Safe Storage and Handling of Sodium Dichloroisocyanurate
SDIC is generally safe and stable, but proper storage and handling are crucial for long-term effectiveness:
- Store in a cool, dry, and well-ventilated place.
- Keep in the original sealed container.
- Avoid mixing with acids, ammonia, alkalis, reducing agents, and flammable materials.
- Use personal protective equipment (PPE), including gloves and safety glasses, during handling.
- If accidental contamination or degradation occurs, do not reseal the container; isolate it in a well-ventilated area.
Following these guidelines will ensure that SDIC maintains its maximum chlorine supply and minimizes safety risks.
How to Choose a Professional SDIC Manufacturer
For B2B buyers and distributors, sourcing SDIC from a reliable factory-direct supplier offers significant advantages:
Stable Supply and Large-Scale Production:
Professional manufacturers maintain stable inventory levels, ensuring uninterrupted supply for large-scale projects.
Consistent Quality and High Purity:
Strict quality control ensures that every batch of product meets the stated active chlorine content.
Flexible Product Forms:
SDIC is available in various forms, including granules, powder, and tablets, to meet specific customer requirements.
Extensive Manufacturing Experience:
Years of professional experience enable us to provide accurate dosage guidance and technical support for various applications.
Export Compliance Ready:
SDIC is manufactured according to ISO, NSF, REACH, and BPR standards, making it suitable for international markets.
Choosing a professional SDIC manufacturer ensures maximum efficiency in algae and bacteria control and reduces operational risks in industrial, aquaculture, and public water supply systems.
SDIC is a highly effective, stable, and versatile chlorine disinfectant with excellent inhibitory effects on both algae and bacteria. It is an ideal solution for modern water disinfection systems and a strategic product for businesses seeking a reliable, high-performance disinfectant and wishing to purchase directly from a professional manufacturer.
As a factory specializing in SDIC, we offer:
- Stable, high-quality chlorine disinfectant in granular and tablet forms.
- Large-scale supply.
- Customized packaging and logistics solutions for B2B customers.
Contact us today for a quote, to discuss your water treatment needs, or to learn how SDIC can improve algae and bacteria control in your system.
Post time: Jan-26-2026