Chlorine Tablets or Granules? The Ultimate Guide

Making sure you have the right swimming pool chemicals is a vital part of maintenance. For many of us, chlorine will be the go-to sanitiser, helping to keep our water clear, clean and safe.

However, as with everything when it comes to pool maintenance, there are multiple options when it comes to what chlorine you use. While you should always ensure you choose a high-quality and trusted brand, the choice between which style of chlorine is entirely up to you.

There are advantages for both tablets and granules, and in this blog, we’ll help you choose which is best for you.

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Why Do Swimming Pools Need Chlorine?


As mentioned above, chlorine is the number one choice for swimming pool sanitisers. The chemical, when placed in water, kills any germs present, making the pool safe for swimmers.

Of course, chlorine isn’t the only chemical required for good pool management. Other products, such as alkalinity and pH increasers and reducers, play an essential role, but part of their job is to help the chlorine perform safely and effectively.

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Chlorine Tablets


Arguably the most common form of chlorine is as a white tablet. These tablets contain a higher concentration of chlorine which breaks up over a period of time – usually around five days, but this can vary on size and conditions.

The Advantage of Chlorine Tablets for Swimming Pools

The most significant benefit of using chlorine tablets for your pool is its longer-term nature compared to granules. Once you get the right dosage, you shouldn’t have to add another chlorine treatment for at least a few days.

The only downside to chlorine tablets is that the longer-term approach is more susceptible to changes in conditions. If, for example, heavy use means you need to replenish chlorine levels quickly, this can be more challenging with tablets.

Chlorine Granules


Another popular form of chlorine for swimming pools is granules. Unlike tablets, granules come in a significantly lower concentration which, along with their size, make them easy to dissolve in water. To add chlorine granules to the water, you simply sprinkle them around the surface instead of using a dispenser.

The Advantage of Chlorine Granules for Swimming Pools

The key selling point of granules over tablets is their speed. Because they dissolve quicker, they can get to work against algae and bacteria faster. It’s this advantage that makes granules a go-to for shock treatments, for example.

The downside of granules and their fast-acting nature is how frequently it needs to be used. Unlike tablets, which can sometimes be left to work on their own for days, granules will require more work in terms of maintaining and balancing chemical levels.

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Tablets or Granules – Which is Best for My Pool?


Ultimately, no matter what form you chose, both do the same role. Your preference simply comes down to the needs of the pool and how much time you have.

If you notice that the chemicals in your pool rise and fall day-to-day because of sun exposure, debris or another external reason, then granules might be the best choice, because these are more reactive.

On the other hand, if your pool is relatively stable when maintained correctly, chlorine tablets are often the best choice, as these are easier to manage long-term.

Many owners find, though, that the best choice is a combination of the two. While general maintenance is more straightforward with tablets, chlorine shock is almost always done with granules. Therefore, you might choose to have both options on hand.

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We hope this guide will help you find the perfect chemicals for your pool. Remember, we stock everything you need here at 1st Direct Pools, and if you have any questions, our team is always on hand to help.