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How much chlorine do you add to a spa pool

By Hot Spring Spas

How much chlorine do you add to a spa pool

05/19/2022 Chlorine is an essential part of the spa pool experience when it comes to cleanliness and sanitation.
Add 1.5 teaspoons of chlorine granules for every 1,000 litres of water in your spa pool. The goal is to get the chlorine level in the water to be between 3-5 ppm for maximum safety.
Chlorine is what keeps your spa pool free from bacteria and other materials and helps make your spa pool a safe place to soak every time. Getting the correct level of chlorine in a spa pool is crucial to keeping it clean and safe.
Why do spa pools need chlorine?Because the water is warm, spa pools can end up having more bacteria and gunk than you might initially realise.
Spa pools can accumulate skin and hair products, body oils, lotions, dirt, debris and other unwanted particles over time.
There are three ways to prevent bacteria leading to an unpleasant spa pool experience:

  • Adding chlorine granules and maintaining the right level of chlorine
  • Periodically cleaning and replacing filters
  • Routine draining and cleaning of the spa pool itself using spa chemicals and other household cleaning supplies
Chlorine plays a vital role because it’s what keeps spa water free from accumulating bacteria on a day-to-day basis. It’s one of the most effective chemical products out there and works together with the filters to keep your spa pool clean.
Chlorine granules are a popular choice since they dissolve easily. It can be used to shock dose a spa.

How much chlorine granules should be added to the spa pool?Chlorine granules raise chlorine levels much faster than chlorine tablets, so getting the dose right is crucial. Granules are sprinkled directly into the water, so the process is relatively easy.
With the jets on full, add the chlorine directly to the filter compartment in your spa pool, but keep the granules away from the surface of the spa pool as they can cause damage to the acrylic of the spa shell. The water should also be above 20°C to avoid any risk of damage.
If you’re not sure about the water temperature, you can pre-dissolve the chlorine granules to avoid any risks or causing any damage, especially if you have just filled your spa pool with fresh water.
Add some water to a plastic bucket and then mix in the chlorine granules. Once they have dissolved, you can add the pre-dissolved chlorine to your spa pool. It’s best to distribute the water closer to spa pool pumps and inlets so that the chlorine can mix with the water faster. Ensure that jets are on full.
Because chlorine granules dissolve quickly and increase the chlorine level, knowing the volume of water your spa pool contains is very important. Once you know how many litres your spa pool holds, you can add the amount of chlorine granules.
To dose on a weekly basis, the general ratio is around 1.5 teaspoon of chlorine per 1,000 litres of water to achieve 3-5 ppm of chlorine. After every use, it’s recommended to use ½ teaspoon as a supplement to maintain sanitation, particularly if the spa is being used frequently. If required, you can also shock dose once a week with ½ teaspoon of chlorine granules and do water testing to ensure the right chlorine levels.
If you have doubts about how much chlorine granules to add, go slow!
Too much chlorine isn’t good for spa pools, so it’s better not to overdose. You can add chlorine granules slowly, let them dissolve, and then measure chlorine levels to get to the right level.

How often do I need to add chlorine granules to spa pools?The amount of chlorine granules added and the frequency will depend on your usage. ‘Shocking’ the water with chlorine should be done at least once a week or more, depending on how much the spa pool is used.
The term shocking essentially refers to adding a bit of chlorine to mix with any bacteria or oil in the water.
Once it combines, you can add a higher amount of chlorine to get rid of the mixture you’ve created - effectively killing the bacteria. Doing so also helps ensure that your spa pool has balanced water.
Add small amounts of chlorine between shocking to keep levels safe. You should aim for chlorine levels to be between 3 - 5 ppm.
For FreshWater® Salt System, make sure to test chlorine regularly and adjust the Output Level as needed. Concentrated chlorinating granules or liquid chlorine can also be added to as a supplement.
Test the water using a test strip to monitor chlorine levels and adjust it as needed.
Adding chlorine granules to your spa pool keeps it safe and ready to use any time! Keeping an eye on chlorine levels is very important for overall health and safety. The more a spa is used, the more chlorine products you’ll likely need to add to it.
Having a consistent schedule to monitor chlorine levels, the filtration system and draining the spa pool and replacing it with fresh water should all be part of overall maintenance.
The Hot Spring Highlife collection comes with the option of the FreshWater Salt System which generates natural chlorine using pharmaceutical grade salt that effectively and conveniently sanitises the spa water. Water is beautifully luxurious and soft with ultra low residues of chlorine operating at 1ppm, similar to your drinking water.
Have questions about spa pool maintenance or need some extra information around the cleaning process? Contact us today or visit a local dealer.

About This Author

Hot Spring Spas

The world's best-selling spa pool brand, Hot Spring spa pools are now a backyard staple for many Kiwis. Hot Spring is recognised for its outstanding quality, value and an experienced team with decades of spa pool manufacturing experience. Our spa pools are designed for the ultimate massage experienc…

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