When it comes to sanitising a swimming pool, very few substances can beat the likes of chlorine.

At once, an oxidiser, sanitiser and disinfectant, a good quantity of chlorine in your pool can help preserve the water quality. This not only ensures that your pool remains clean and free from microorganism growth but also helps protect the health of swimmers.

Man adding Chlorine to Swimming Pool

However, there’s a catch. Chlorine is a highly volatile chemical, and mixing different types of chlorine can have disastrous consequences. That’s why, to help you add chlorine to your pool safely, we’ve gone ahead and curated this comprehensive guide.

Going through the following will give you a clear idea of adding chlorine to your swimming pool. At the same time, you’ll also get to know what precautions you need to take while undertaking the task.

So, let’s not dally and get going.

How To Add Chlorine To A Swimming Pool

The Importance Of Chlorine

The importance of chlorine as a swimming pool cleaner cannot be overstated. Swimming pools can get polluted due to both living and non-living contaminants. Apart from bacteria, pool water often becomes a cesspool for waste from bathing.

And this is precisely where chlorine can help you out. Chlorine helps to kill close to 100% of bacteria and algae, thus ensuring that your pool remains free of all infectious organisms. At the same time, it also acts as an oxidiser, helping to break down non-living contaminants.

However, breaking down oxidant waste reduces the amount of chlorine in a pool. For this reason, it’s essential to keep on adding chlorine to a swimming pool regularly. The best-case scenario is to have enough chlorine to take care of both living and non-living contaminants.

Now that we know the importance of adding chlorine to a swimming pool let’s look at the steps you can take to add chlorine to your pool. We’ve divided the processes according to the type of chlorine you’re adding.

Steps To Add Dry, Granular Chlorine

The method to add dry, granular chlorine to a swimming pool is relatively straightforward. You just need to measure the chemical, dissolve it in a bucket or similar container, and add the mixture around the perimeter. Take care never to add chlorine directly to the skimmer.

How to add Chlorine to Pool

Dry chlorine usually comes in a few varieties, such as trichlor, dichlor and calcium hypochlorite. These typically dissolve pretty fast in water; however, care must be taken so that different types of chlorine are never mixed.

Before setting out to add chlorine to your pool, you’ll need to measure the pH and alkalinity of the pool water. You’ll also need a bucket or similar container to mix the chlorine in, a stirring stick, and a graduated measuring cup. And yes, be sure to wear protective gear such as goggles and gloves. Now, let’s take a look at the steps to follow.

Step 1. Test The Water

First, you’ll need to test the pool water and determine the amount of free chlorine already available in the water. This will help you choose the amount of chlorine you need to add to the pool.

Step 2. Mix The Chlorine

Next, you need to take a bucket and fill it with three-quarters of water from the pool. Then, add the required amount of chlorine granules to the bucket slowly. Once you’ve added the chlorine, you’ll need to stir the powder to ensure it dissolves completely.

Why is this important? Because adding undissolved chlorine to the pool can result in cloudiness and harm the pool surface. That’s why it’s essential to ensure that the chlorine is ultimately diluted before adding it to the pool.

Step 3. Add The Chlorine To The Pool

Now comes the actual part where you add the chlorine to the pool. Here, you must add the chlorine to the pool slowly and around the perimeter. Never add the chlorine solution directly to the skimmer.

Steps To Add Chlorine Tablets To A Pool

Chlorine is also available in tablet form, and these require a feeder mechanism for regulating the dissolution rate of the tablets. However, it’s important to use the correct type of tablet with a feeder; otherwise, it can lead to severe accidents.

If you’re using trichlor tablets, take care never to add them directly to the skimmer since these tablets are highly acidic. Also, we don’t recommend using chlorine floaters for adding chlorine to a pool, as this can be harmful to the swimmers’ skin.

Steps To Add Chlorine Liquid

Adding liquid chlorine is a much easier process, as the chlorine here is already dissolved. You need to measure the amount of chlorine required and pour it slowly around the perimeter of the pool. Another method you can use to add liquid chlorine to your pool is to pour the chlorine on an inlet responsible for pumping water into the pool.

A Word Of Caution

Before you attempt to add any form of chlorine to your pool, we’d like to reiterate once again the need to wear protective gear. Chlorine can harm your skin and cause severe problems if it gets into sensitive organs such as the eyes.

That’s, you always need to wear protective clothing such as gloves, goggles and aprons when handling chlorine. Also, be sure to exercise caution when handling the chemical, and don’t let it get onto bare skin.


Chlorine is vital for maintaining the quality of your pool water. We hope that after going through the above steps, you don’t have any doubts about adding chlorine to your pool.

That being said, we realise that the process does involve a certain amount of risk. That’s why, in case you don’t want to undertake the task yourself, you should employ professionals to get the job done for you. This will not only save you time but also ensure your safety.

If you need help from a professional pool builder in Sydney, contact us today for our expert advice.

That’s all we have to say for today. Till next time!

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