Maintaining clean and safe water is a top priority for any commercial or residential pool operator. Among the many sanitizers available, Sodium Hypochlorite 12.5%—commonly known as liquid chlorine or bleach—is one of the most effective and widely used solutions for pool disinfection. It plays a crucial role in eliminating bacteria, viruses, and algae, ensuring water clarity, and maintaining proper sanitation levels.
In this guide, we’ll dive deep into what sodium hypochlorite is, how it works, when to use it, and best practices to ensure optimal performance.

What is Sodium Hypochlorite?

Sodium hypochlorite (NaOCl) is a liquid chlorine compound commonly used in swimming pools, spas, and industrial water treatment. It contains 12.5% available chlorine, making it a powerful oxidizer and disinfectant.

How Does It Work?

- When added to water, sodium hypochlorite releases hypochlorous acid (HOCl), the active form of chlorine responsible for sanitizing and breaking down contaminants.

- It oxidizes organic matter, such as sweat, oils, and bacteria, ensuring pool water remains clean and safe.

- It helps prevent algae growth, keeping the pool clear and free from green water issues.

When to Use Sodium Hypochlorite in Pools & Spas

Sodium hypochlorite is a go-to choice for pool operators in several situations:

✅ Daily Pool Sanitization: Maintains proper chlorine levels in commercial and residential pools.

✅ Shocking the Pool: Helps eliminate combined chlorine (chloramines) and restores water clarity.

✅ Algae Treatment: Effective against green, yellow, and black algae when used in higher concentrations.

✅ Emergency Disinfection: Used in cases of contamination, such as fecal accidents or waterborne illnesses.

✅ Winterization Preparation: Ensures water is clean before closing the pool for the season.

How to Use Sodium Hypochlorite

Proper handling and dosage are critical for ensuring safety and effectiveness.

📏 Dosage Guidelines:

- Routine Sanitization: 1–2 gallons per 10,000 gallons of water per week, depending on bather load.

- Shock Treatment: 3–5 gallons per 10,000 gallons of water.

- Algae Removal: 5–7 gallons per 10,000 gallons, depending on severity.

🛠️ Application Tips:

✔ Pre-dilute in a bucket before adding to the pool for even distribution.

✔ Apply in the evening or when sunlight is low to prevent chlorine loss.

✔ Test chlorine levels regularly to maintain 1-3 ppm of free chlorine.

✔ Store properly in a cool, well-ventilated area away from direct sunlight.

Pros & Cons of Sodium Hypochlorite

✅ Pros:

✔ Fast-acting and highly effective sanitizer.

✔ Ideal for commercial pools due to its high chlorine concentration.

✔ No residue—completely dissolves in water.

✔ Easy to apply and widely available.

❌ Cons:

⚠️ Can degrade quickly when exposed to heat and sunlight.

⚠️ Requires careful storage to prevent spills or leaks.

⚠️ High pH (above 11) may require additional pH balancing with muriatic acid.

⚠️ May cause skin and eye irritation if handled improperly.

Safety & Storage Tips

Store in a cool, dry place in a vented, chemical-resistant container.

Never mix with acids or other chemicals, as dangerous reactions may occur.

Wear protective gloves and goggles when handling.

Keep away from children and pets.

Sodium hypochlorite 12.5% is an essential tool for commercial and residential pool maintenance. It offers fast-acting sanitation, algae prevention, and shock treatment capabilities, making it a top choice for pool operators.

By using sodium hypochlorite correctly and following best practices, you can maintain a safe, clean, and well-balanced pool year-round. Orca Pacific proudly supplies high-quality Hypochlorite Solution Sodium Hypochlorite 8, PGIII 12.5% to keep your pool in top condition.

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