How to counteract chlorine in a spa pool

 If you own a spa pool, at some point youll find yourself facing high chlorine levels. Most of the time its not even intentional, it just happens. If youve recently found yourself in that situation, dont worry! At mySpa Sydney weve got you sorted. Here are some tips on how to counteract too much chlorine in a spa pool.


What causes high chlorine levels?

High chlorine levels can be caused by things such as putting too many chlorine tablets in your pool. You may have put more tablets than your spa pool actually needs without realising it. Or you may have added a bit too much shock to the water. Having a spa pool with high chlorine levels can happen to anyone.

Read More How to Keep Your Spa Pool Water Cleaner for Longer


How much chlorine should there be?

To check how much chlorine should be in your spa pool, make sure to test your pool water with either test strips or a liquid test kit. This will give you the most accurate result. An ideal chlorine level is 3 ppm. If youre testing your spa pool several times a week, keep track of what your levels are and adjust accordingly if necessary. If your levels are below 2 ppm, it may be because your spa pool is not properly sanitized. This means it could be unhygienic and grow a lot of gross things in there. On the other hand, if the chlorine levels in your spa pool are above 4 ppm, youll need to bring those levels down to a safe range as soon as possible.


Effects of too much chlorine

If your spa pool has too much chlorine, you may notice things such as your swimwear fading in colour after one use. Too much chlorine may also start to damage your pool cover. Having too much chlorine in the spa pool can be dangerous if you have friends and family members who have sensitive skin or underlying health conditions. For example, it may cause eye irritation, over-dried skin, and possibly some breathing problems. If theres too much chlorine it will vaporise and form gas that floats just above the surface of the water. If this vapor is inhaled it can inflame airways and exacerbate certain breathing conditions.

Read more What Temperature Should My Spa Pool be at and Why?


How to reduce chlorine levels in a pool?


To counteract chlorine and reduce the levels in the pool you can leave the cover off of the pool for a few days. This will give your pool time to process the chlorine on its own. Ultraviolet light from the sun will break down chlorine naturally over time. The sunlight will burn chlorine out of the water. Make sure no one goes into the spa pool until the levels have dropped back down into the safe range. While youre waiting for nature to work its magic, dont add any chlorine to the water either.


Drain and refill the pool

If you need to reduce your chlorine levels by 1-2 ppm, diluting your pool water by draining and adding fresh water is another option. By draining your pool, and replacing the water, you are effectively diluting your water. This also means other chemicals in your spa pool are being drained too so make sure to test the water after. The addition of freshwater will change your pH, alkalinity, and calcium hardness levels. Remember to adjust these once youve finished adding fresh water to the pool.


Use the spa pool

If youre trying to reduce chlorine levels by 1 3 ppm then another option to neutralize chlorine is to use the spa pool. Get your friends and family together to hop in for a swim. Levels of around 5 ppm can be high but are generally safe for swimming. Make sure not to swim in water with chlorine levels above 10 ppm. If you do, you and other people in the spa pool could run the risk of serious skin irritation and discomfort.



To counteract chlorine in your spa pool sometimes you may need to use chemicals to help you out. Hydrogen peroxide is sold as a pool chemical oxidizer, which means it works to break down chlorine through chemical reactions. Youll need to get hydrogen peroxide thats specifically made for pools, not the one sold in first aid kits. If your pools pH is higher than 7, this will reduce chlorine levels. If your level is below 7 it wont be effective, so youll need to raise the pH before adding it.


Chlorine Neutralizer

To neutralize chlorine in the spa pool, a chlorine neutralizer is also helpful. Sodium thiosulfate, sodium sulfite, sodium bisulfite, and sodium metabisulfite also known as chlorine neutralizer is a quick and easy way to reduce chlorine levels in a pool. Make sure you add the neutralizer gradually. Remember not to add too much at once or else youre liable to destroy all the chlorine. Starting by adding a small half-cup scoop but if it comes with specific instructions make sure to follow those for best results. These types of chemicals can impact the pH of the water. Make sure you test the pH before and after adding the chemicals and adjust accordingly every time.


Vitamin C

Adding Vitamin C to the spa pool can also counteract chlorine. This works for very high chlorine levels that need to be lowered quickly. It can also be used on vinyl liners and fiberglass surfaces. Its a safe option as no harsh chemicals are involved.

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If you have too much chlorine in your pool, counteracting it is simple. At one point or another weve all needed to do it. At mySpa Sydney were here for all your spa pool needs. Get in touch with us if you have any questions or looking to buy a new spa pool. You can contact us on 02 8850 6550 or fill out a contact form online.