Hydropool Chemicals For Hot Tub & Swim Spa

Hydropool chemicals and water treatment help keep your hot tub or swim spa safe and clean. We keep a complete range readily available at our Devon and Bristol showrooms.

Many chemicals are a necessity when it comes to keeping your hot tub or swim spa clean and safe. The good news is that Hydropool spas are great at maximising the efficiency of your chemicals because of their world-renowned filtration systems and setup. Even if you don’t have a Hydropool spa, you can still use Hydropol chemicals.

With additional Hydropool chemicals such as a foam removing chemical, as well as general cleaning products for your spa, we are here to help you keep on top of your spa maintenance.

Visit our online store to buy chemicals by clicking the button below, or read on to learn more about what chemicals you need with helpful links to each product.

To make it even easier for you, we also offer swim spa and hot tub service packages that allow our trained and experienced engineers to look after your spa. Click the link to find out more information about these packages.

Hot Tub Chemicals UK

There is no getting away from buying most chemicals to keep your hot tub or swim spa in safe working order, however, there are some that do not need to be used as frequently. Let’s discuss some of the main chemicals that you need and where you can buy them.

Hot Tub Sanitisers

For bacterial control, a sanitiser such as chlorine or bromine helps to disinfect the water and keep it free from bacteria. While they are both sanitisers, their properties vary slightly so we will discuss the differences. You can choose between standard granules, that you measure and pour directly into the spa water, or pucks, which go in a chemical dispenser either in their own compartment (in self-cleaning models) or in a floating device, which you can also find on our store.


Chlorine is the most widely known water sanitiser, commonly found in exceptionally high levels in public swimming pools and spas.

It is more reactive than bromine, meaning it will kill bacteria faster. This makes it effective when adding sanitiser to dirtier water, but also means that it gets used up more quickly than bromine, which has a slower effect.

Of course, if your water is THAT dirty, you should drain and refill it before adding chemicals and water treatment.

Although chlorine is harsher for people with respiratory conditions or sensitive skin at high potencies, it is important to note that public swimming pools have to use an exceptionally large amount of chlorine to keep pools safe for the general public because of the number of different people using the water regularly, each contaminating it with their own bacteria that they carry into the pool with them!

If you have sensitive skin and want to be on the safe side, bromine could be a better option.

You can buy chlorine granules here.



Bromine also comes from chlorine to an extent so they are very similar in terms of their primary function of killing bacteria, but there are some differences that cause some people to prefer to use bromine.

Bromine is slower to kill bacteria. This could prevent your spa from being safe enough to use immediately after treating it with bromine if the chemical balance in the water hasn’t remained consistently stable in recent hours/days prior.

On the flip side, due to these properties, it doesn’t get used up so quickly and allows for a more stable pH level. This makes it a solid choice for people that are more consistent with their chemical balancing.

You can buy bromine granules here.


Hot Tub Shocking Chemicals

‘Shocking’ your spa water is the process of adding oxidising chemicals to help remove any additional impurities. The obvious sign of a hot tub or swim spa in need of a good old shock is cloudy water, particularly when pH levels are balanced and you are wondering why your water doesn’t look clean.

Oxidising chemicals can come in chlorine and non-chlorine forms, but we recommend and therefore supply non-chlorine shock. You should never mix different shock chemicals.

Non-Chlorine Shock Chemicals

If your chlorine, pH, and alkalinity are fine but your spa water is cloudy, a non-chlorine shock treatment could be preferred. Due to the lack of chlorine, it will not raise the pH or chlorine levels in your spa, making it safer to get back to using it more quickly. We generally recommend non-chlorine shock because your chlorine levels should already to kept under control and not need additional chlorine from shocking the water.

You can buy non-chlorine Oxyshock here.


Balancing Hot Tub pH Level

One of the most important aspects to keep on top of is the pH level of the water you are using, a high pH can lead to skin/eye irritation, whilst a low pH can lead to corrosion of equipment, especially metals. We have a pH increaser and a pH reducer to help you keep on top of your pH levels and avoid any negative effects of an unbalanced spa.


Hot Tub and Swim Spa Filtration

To keep your spa safe and usable, the importance of circulation and filtration is high. Filter cartridges should be cleaned every 4-6 weeks, but more frequently should you notice any water contamination (such as grass, leaves, or dirt). In this case, your filters should be cleaned immediately. Some of our clients prefer to swap filters more regularly as opposed to deep cleaning their existing ones. You can find hot tub and swim spa filters at our shop here.


If you would like to learn more about our water treatment chemicals and accessories, please fill in your details below or call us on 01803 872 666.

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