Swimming Pool Chlorine

Swimming Pool Chlorines – Powerful Sanitiser & Water Protection

Keeping your swimming pool water clean, clear and safe starts with effective sanitation — and nothing does that better than chlorine. At PoolStore we offer a wide range of swimming pool chlorines designed to control bacteria, destroy contaminants and maintain balanced water all season long. Explore everything from everyday chlorine tablets and granules to chlorine shock treatments for tackling stubborn green or cloudy water. Whether you’re maintaining a family pool in summer or preparing your water for peak usage, the right chlorine product makes all the difference.

What Is Swimming Pool Chlorine & Why Do You Need It?

Chlorine is one of the most trusted and widely used sanitising chemicals for pools worldwide. When dissolved in water, chlorine forms hypochlorous acid — a powerful sanitiser that: 

• Destroys bacteria, viruses and harmful microorganisms
• Prevents algae growth
• Controls organic waste and contaminants
• Keeps water safe for swimmers

Without sufficient chlorine, pool water rapidly becomes cloudy, unhealthy and prone to algae outbreaks. Regular chlorination protects your investment and keeps your pool inviting.

Types of Chlorine Products We Offer

Choosing the right chlorine format depends on how you maintain your pool and the conditions you’re treating. Below are the main chlorine types in our range:

Chlorine Tablets — For Routine Sanitisation

Chlorine tablets dissolve slowly and consistently, releasing sanitising chlorine over time. They’re ideal for day-to-day maintenance and are often used in automatic chlorinators or floating dispensers.

• Consistent chlorine levels
• Weekly pool care
• Automated dosing systems

Chlorine Granules — Fast & Flexible Dosing

Chlorine granules dissolve quickly, making them perfect for adjusting chlorine levels precisely or targeting short-term needs. Some granules are stabilised to protect chlorine from sunlight breakdown. Best for:

• Quick chlorine boosts
• Post-storm or heavy usage
• Flexible dosing control

Shock Chlorine — Powerful Treatment for Green or Cloudy Water

Shock chlorine has a high concentration of sanitising power and is used when regular chlorine isn’t enough. It’s the go-to solution for algae outbreaks, cloudy water or when first opening a pool. Best for:

• Cleaning up green pools
• Heavy contamination events
• Seasonal pool openings

How to Use Swimming Pool Chlorine Safely

Proper application of pool chlorine ensures excellent results and long-lasting water quality. General recommendations:

• Always test your water before adding chlorine
• Adjust your pH to 7.2–7.6 for optimal chlorine effectiveness
• Add granules by dissolving in a bucket of water first
• Use tablets in a floater, chlorinator or skimmer feed
• Run your pump after dosing for at least 6–8 hours

Regular testing and dosing keeps your chlorine levels within the recommended range and helps prevent common issues such as algae or odour

Chlorine & Water Balance – A Winning Combination

• pH between 7.2–7.6
• Alkalinity within target range
• Calcium hardness stable

A balanced pool prevents chlorine loss, reduces eye irritation and extends the life of your equipment.

Useful Chlorine Tips & Pool Care FAQs

How often should I add chlorine to my pool?

Test chlorine levels at least twice weekly. In warmer months or during heavy use, your pool may require more frequent dosing.

What chlorine level should I aim for?

A free chlorine level of 1–3 ppm (parts per million) is a good target for most domestic pools.

Can I mix chlorine types?

Avoid mixing different chlorine formats directly. Adding one product at a time and allowing it to dissolve fully prevents chemical reactions and cloudiness.

Do I need stabiliser with chlorine?

Stabiliser (cyanuric acid) helps protect chlorine from rapid breakdown by sunlight, especially in outdoor pools. Many chlorine tablets already contain stabilisers.

Shop Our Full Range of Pool Chlorines

Browse our selection of chlorines above and find the right sanitiser for your pool. From everyday chlorine tablets to powerful shock treatments, PoolStore has the products you need with fast UK delivery and expert support.