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How to Safely Add Chlorine to Pool

How to Safely Add Chlorine to Pool

Understanding Chlorine

Chlorine is an essential chemical used to maintain the cleanliness and safety of your swimming pool. It acts as a sanitiser, killing harmful bacteria and algae that can cause health problems for swimmers. There are different types of chlorine available in the market, and each has its advantages and disadvantages.

Types of Chlorine

Chlorine Tablets

Chlorine tablets are the most popular form of chlorine for pool owners. They are easy to use, slow-dissolving, and provide a consistent release of chlorine. They come in various sizes and typically dissolve over a week, making them a low-maintenance option.

Liquid Chlorine

Liquid chlorine is a fast-acting and highly concentrated form of chlorine. It’s easy to measure and apply, and its rapid action makes it an excellent choice for a quick boost of chlorine or shock treatment. However, liquid chlorine has a shorter shelf life and requires more frequent application.

Granular Chlorine

Granular chlorine is a powder form that can be sprinkled or dissolved in water before being added to the pool. This type of chlorine is also fast-acting and easy to measure, but it requires more effort and can be less convenient than other options.

When to Add Chlorine

Testing Your Pool Water

It’s essential to test your pool water regularly to ensure that the chlorine levels are adequate for keeping your pool clean and safe. You can use test strips or a liquid test kit to measure your pool’s chlorine levels. The ideal range for chlorine in a swimming pool is between 1 and 3 parts per million (ppm).

Frequency of Chlorine Application

Depending on the type of chlorine you choose and factors like pool usage, weather, and water temperature, you may need to add chlorine daily, weekly, or even monthly. It’s crucial to monitor your pool’s chlorine levels and adjust your application frequency as needed.

How to Add Chlorine

Safety Precautions

When handling any pool chemicals, including chlorine, always wear protective gear such as gloves and goggles, and work in a well-ventilated area. Chlorine is a powerful chemical that can cause skin and eye irritation, as well as respiratory issues if inhaled.

Adding Chlorine Tablets

To add chlorine tablets to your pool, use a floating dispenser or an automatic chlorinator. Fill the dispenser or chlorinator with the appropriate number of tablets, following the manufacturer’s instructions. The dispenser will slowly release chlorine into your pool water as the tablets dissolve.

Adding Liquid Chlorine

To add liquid chlorine to your pool, measure the correct amount based on your pool’s volume and the manufacturer’s instructions. Pour the liquid chlorine slowly and evenly around the perimeter of the pool. It’s best to do this during the evening or early morning when the sun is not at its peak to prevent chlorine from evaporating quickly.

Adding Granular Chlorine

To add granular chlorine to your pool, first, determine the correct amount based on your pool’s volume and the manufacturer’s instructions. Dissolve the granules in a bucket of warm water, stirring until completely dissolved. Then, slowly pour the solution around the perimeter of your pool, ensuring even distribution. As with liquid chlorine, it’s best to do this during the evening or early morning to minimise chlorine loss due to sunlight.

Maintaining Proper Chlorine Levels

Monitoring and Adjusting

It’s important to regularly test your pool water to ensure the chlorine levels remain within the ideal range (1-3 ppm). If the chlorine levels are too low, harmful bacteria and algae can thrive, putting swimmers at risk. If the levels are too high, it can cause skin and eye irritation for swimmers. Adjust the amount of chlorine you add to your pool based on your test results.

Shock Treatment

Occasionally, you may need to perform a shock treatment on your pool to restore the water quality. Shock treatment involves adding a high dose of chlorine to eliminate contaminants and break down chloramines, which are byproducts of chlorine reacting with organic material in the water. You should perform shock treatments as needed, based on water clarity and test results.


Safely adding chlorine to your pool is crucial for maintaining a clean and healthy swimming environment. By understanding the different types of chlorine, testing your pool water regularly, and following safety precautions when handling chemicals, you can ensure that your pool remains a safe and enjoyable place for everyone.

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