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What happens if you put too much chlorine in a hot tub?

Author

Mia Kelly

Published Jan 10, 2026

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?

What do I do if I put too much chlorine in my hot tub?

We recommend that you allow the sanitizer levels to break down naturally. But if you have to use your hot tub, then you can add sodium thiosulfate to the water. Sodium thiosulfate will break down both chlorine and bromine in your water. This will lower the bromine or chlorine levels fast so you can soak sooner.

What are the symptoms of too much chlorine in a hot tub?

Chlorine poisoning can be very serious and causes symptoms including:

  • Nausea and vomiting.
  • Coughing and wheezing.
  • Burning sensation in eyes, nose and throat.
  • Rash or burning skin.
  • Shortness of breath.
  • Dizziness.
  • Watery eyes.

Can I go in hot tub with high chlorine?

Lower your hot tub's free chlorine level if it's over 3 ppm.

Three ppm is the recommended free chlorine level for preventing disease-causing germs in a hot tub. A free chlorine level that's higher than that could possibly irritate your skin, eyes, and lungs when you use your hot tub.

What happens if chlorine levels are too high?

Excess chlorine can alter the pH level of the water in the pool, making it more acidic. The acid levels can cause any of the following symptoms: Irritant dermatitis which is a red skin rash characterized by raised itchy red bumps. Eye irritation and over-dilated blood vessels in the eyes.

33 related questions found

Does chlorine affect pH in hot tub?

Chlorine is a powerful chemical that can reduce the pH level of water in hot tubs. Therefore, it's important always to add chemicals slowly and carefully, wait 20 minutes before testing again.

Can too much chlorine in pool make it cloudy?

Excessive levels of pool chemicals can cause your water to become cloudy. High pH, high alkalinity, high chlorine or other sanitisers, and high calcium hardness are all common culprits.

How long does it take for chlorine to evaporate from a hot tub?

One ppm of unstabilized chlorine will dissipate in 15 minutes or less under direct sunlight. With heated spa water, this dissipation rate is even faster. The loss can be controlled with a separate, one-time addition of CYA.

How long does chlorine last in a hot tub?

How Long do Chlorine Tablets Last in a Hot Tub? Small 20g chlorine tablets will dissolve slowly over a period of 3-7 days depending on water flow, water temperature and hot tub usage.

Does pH reducer lower chlorine?

No matter what you use, follow the instructions carefully. Typically, 60 grams will reduce the chlorine by 1ppm in an average backyard pool. Add your neutralizer gradually. You should also look at your pH levels to see if you need to add in pH, as chlorine reduces the amount of pH in water.

Can chlorine in a hot tub make you sick?

“If those water droplets contain the bacteria and they're carrying that bacteria into the air, if you inhale them you can become infected." Legionella likes warm water, and when chlorine or bromine levels drop, the germ can survive and multiply in the slime, called biofilm, that appears on the walls of some hot tubs.

How long does it take for chlorine to evaporate from water?

How Long Does It Take for Chlorine to Evaporate Out of Water? Water needs to sit for a minimum of 24 hours to dechlorinate. It can actually take almost 5 days for chlorine to evaporate completely from the water, depending on the initial concentration of the chlorine, and the total volume of water.

Should I add chlorine to my hot tub every day?

How much chlorine should I add to my hot tub? Aim to maintain a chlorine level of 3 to 5mg/l at all times. How frequently you add more chlorine will depend on your usage and bathing habits. It could be daily, every two to three days or weekly.

Can too much chlorine make hot tub cloudy?

Yes, too much chlorine can cause cloudiness in water. It means there is an imbalance in the hot tub chemicals. High pH, high alkalinity, and high calcium hardness can also cause cloudy water. pH levels directly are not associated with cloudiness in water.

How often do you put chlorine in a hot tub?

You should put chlorine in your hot tub at least once a week. However, some people prefer to add a small amount after each use. Finding the best water care routine will depend on how often and how many people use it. Chlorine levels should be between 1.5 and 3.0 ppm.

Why is my hot tub water cloudy and foamy?

Cloudy or foamy water is often an indication that the chemical balance of your spa water is not quite right. Over time, this can even cause damage to your hot tub, corroding certain parts or discoloring the walls.

How do you tell if there is too much chlorine in a pool?

If the chlorine smell is very strong, however, you may soon spot “red-eyed” swimmers emerging from the pool. That's when the pool water is assumed to have “too much chlorine” in it. Ironically, a strong chemical smell around the pool and “swimmer red eye” may be signs that there is not enough chlorine in the water.

How do I clear up cloudy water in my hot tub?

How to fix and clear cloudy hot tub water

  1. Check your filter(s). This is your first point of call with any water quality problem, especially when clarity is an issue. ...
  2. Check the water balance levels. Your second point of call is the water balance. ...
  3. Shock the spa. ...
  4. Try a clarifier. ...
  5. Last resort, empty the spa.

Why is my hot tub pH always high?

Hot tubs in particular generate a lot of bubbles and tend to have higher temperatures. This combination creates a gas called carbon dioxide very quickly. Carbon dioxide builds up and makes the pH go up. This is why hot tub owners, on a regular basis, need to add something to lower their pH and alkalinity.

How much chlorine do I put in my hot tub?

When a hot tub has been refilled, it is important to give the water a high dose of sanitiser. This can be done by adding 60g of chlorine granules per 1,500 litres of water to start the sanitation process and allow the level to drop to 3-5mg/l before using the hot tub.

Is it safe to get in hot tub with low pH?

For your hot tub, the water should be between 7.2 and 7.8. When your pH is low, the water is more acidic than it should be. You might notice that the water causes your eyes to sting and skin to itch. When your pH is very low, it is not safe for soaking.

How much chlorine should I put in my hot tub a week?

Calculate how much chlorine (sodium dichlor) you need. The goal of shocking is to temporarily increase the free chlorine level to 10 ppm. Shocking a hot tub requires about 2 ounces (4 tablespoons)of chlorine for every 500 gallons of water.

How often should you shock a hot tub?

Regular hot tub shocking is inevitable to keep your water clean and safe for use. Dead skin and other elements like hair may end up dropping in the hot tub, leaving the tub in a mess. It is essential to shock the hot tub frequently – at least once every week.

Should I use a floating chlorine dispenser in hot tub?

A floater is really the worst way to take care of sanitizing your tub—about the most “dinosaur” method still used. It's difficult to regulate the amount of sanitizer being dissolved into the body of water. Then, it starts to seek out what it wants to “eat” after bacteria is gone: pH, tub shell, and more.

Will boiling water remove chlorine?

Yes, boiling water for 15 minutes is one way to release all the chlorine from tap water. At room temperature, chlorine gas weighs less than air and will naturally evaporate off without boiling.