Help! Too Much Chlorine In Pool: How To Lower Chlorine Level In Pool?

As a pool owner, most of your pool maintenance time will be spend raising your chlorine level than trying to lower it. But there are those times you will realize that your chlorine levels are extremely high and you need to lower them. It’s important that’s as you lower the chlorine levels in your swimming pool; you do not entirely strip the pool of chlorine. Try to bring it to safe levels that will not harm the swimmers and pool equipment but will provide the necessary sanitation.
Chlorine is an excellent pool sanitizer as it kills organic matter in the pool such as bacteria and keeps algae off your pool. However, too much of it will result to red eyes, skin irritation and a cloudy pool. Always use a tester to check your chlorine levels and keep them at 1.0 to 3.0 parts per million. If you realize the pool chlorine levels are high, the faster you act to lower the level, the better for you.

What causes too much chlorine in the pool?

Correctly shocking the pool water results in very high chlorine levels, more than 10ppm. You will have to allow the shock to sanitize and oxidize the pool for a minimum of 8 hours before you can try to lower the chlorine levels in the pool.
Another cause of high chlorine levels is setting your chlorine feeder, chlorinator or chlorine floater too high. Still, you may have added a lot of chlorine to the device which results in the chlorine going higher in the course of time.
When there is less sunlight, heat or bather load, then your pool needs less free chlorine in water as the demand for chlorine is less.

How to lower chlorine level in pool

Test your swimming pool chlorine level

testing chlorine levels
By testing your pools chlorine levels, you will be able to establish how severe the problem is. Is it extremely high or just above what is required? If it’s not really high, you can leave it for several hours under direct sunlight and the chlorine levels should be able to drop to the necessary levels. If you have shocked your pool, the levels might be really high and you may have to add a neutralizing chemical.

Lower you pool chlorine with the direct sunlight

This may appear obvious but if your swimming pool is over chlorinated, just remove the pool cover and let it stay open, the direct sunlight will dry up and burn the chlorine in the water thus lowering your pool chlorine levels. These may take some days. Test the chlorine levels until you achieve the normal levels in your pool.

Stop your regular pool maintenance program

recommended swimming-pool-chlorine-level-range
Stop adding chlorine in your swimming pool until the levels are lowered. You will also have to turn off your chlorine feeder so that you do not keep adding more chlorine. In addition, ensure your chlorine feeding device is the right size for your swimming pool. If it’s too big, chances are that it will be over chlorinated.

Dilute your pool water

To dilute the level of chlorine in your pool, you can add extra water. You will have to drain some of the water already in the pool before adding in more water. This way you can effectively dilute the levels.

Decrease pool chlorine with neutralizing chemicals

There are various chemicals in the market that will help in lessening pool chlorine. For instance, if you have friends coming over for a pool party within short notice, then the best way of reducing your pool chlorine levels is using a chemical neutralizer. The important thing is to follow the manufacturer’s instructions exactly as they are or you may end up with a pool that has no chlorine at all.

Reduce pool chlorine with Sodium thiosulfate

sodium thiosulfate
Sodium thiosulfate is an excellent chemical that is used in decreasing the chlorine levels in a swimming pool. Sodium sulfite, sodium bisulfite, and sodium metasulfite are just variations of sodium thiosulfate. It’s best to talk to your pool provider so that they can they can advice you on the best product that will cater for your needs. The only shortcoming with these chemicals is that they reduce the pool pH. So you will have to test the pH of your pool water before and after this kind of treatment so that you can establish whether you will need to add a pH increaser to raise the pH level.

Lowering pool chlorine with Hydrogen Peroxide

hydrogen peroxide
Hydrogen Peroxide can decrease chlorine in your swimming pool. However, you may have to buy hydrogen peroxide that is only meant for use in swimming pools only and not the one that’s often found in retail stores as its not strong enough. Hydrogen peroxide helps in decreasing your pH levels when they are more than 7. In normal circumstances, your pool should have pH levels of 7.0. If your pool pH levels fall below 7.0, hydrogen peroxide is ideal.

Add more chlorine to your pool

If you can smell a strong chlorine odor in the pool, add more chlorine. Contrary to what most people may think is right, the pool may be under chlorinated. This occurs when the available chlorine turns to oxygen in the air and produces that odor. This means that the chlorine is no longer doing what it’s expected to do in the water.


Do not get rid of all the chlorine, just the minimum to bring down the levels to what is normal. Naturally, if there is enough sunshine shining directly on your pool, excess chlorine will be removed. If there is sufficient time before using your pool again, removing the cover when there is sunshine works perfectly in lowering chlorine levels. If you are having guests on short notice, then you will need to add a chemical. Be aware that chemicals may alter pH levels of your pool.

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