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Why is my chlorine level so high?

6 min read

Asked by: Bryce Selfaison

Shocking the pool means adding extra chlorine to the water to eliminate excess bacteria, algae and other microorganisms from your pool. If you miscalculate and add more tablets or granules than necessary during the shocking process, or during routine maintenance, this can cause a high chlorine level.

Why is my chlorine level staying high?

Adding too much pool shock or putting too many chlorine tablets to the feeder can both result in very high levels of chlorine. Another common way to over-chlorinate a pool is to leave a liquid chlorine pump running all night – you’ll often come in the next day to discover a greenish-looking pool.

How long does it take for high chlorine levels to go down?

Heavy shocking with granular chlorine will generally require 24-48 hours before the chlorine level has dropped to safe swimming levels (below 5 ppm).

Why is my chlorine level not going down?

Excess Chlorination



In many cases, the simplest reason for high chlorine levels in a pool is because too much chlorine is being added. Chlorine works by binding with microorganisms in a pool’s water, thereby dissipating itself.

Can you swim in pool with high chlorine?

Having too much chlorine in your pool water can be dangerous. Exposure to high levels of chlorine can cause lung irritation, skin and eye damage, and provoke asthma. Not only is it bad for your health, but it can be bad for your pool due to the increase in chlorine.

How do I bring my chlorine level down?

Tips to Lower the Chlorine Level in Your Pool

  1. Stop Adding Chlorine and Start Swimming. …
  2. Use the Sunshine. …
  3. Heat the Pool Water. …
  4. Dilute the Pool. …
  5. Use Hydrogen Peroxide. …
  6. Use a Chlorine Neutralizing Product. …
  7. Try Sodium Thiosulfate.


Will lowering pH lower chlorine?


Or higher it will also lower your ph after using it so be sure to test and adjust your levels then too number four add a chlorine neutralizer. Like sodium thiosulfate. This is one of the quickest.

Will Shock raise free chlorine?

“Shocking” refers to the process of adding chlorine or non-chlorine pool chemicals to the water in order to raise the “free chlorine” level. The goal is to raise this level to a point where contaminants such as algae, chloramines and bacteria are destroyed.

What happens if you put too much shock in a pool?

Although, if you overdo the shock treatment, you risk getting green hair from chlorine due to the excess chlorine oxidizing the copper in the water. You can execute a shock treatment with a few different types of pool shock, just be mindful of how much you’re using.

Does high chlorine make pool 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.

What is the highest chlorine level safe to swim in?

The ideal level of free chlorine in the swimming pool is 2 to 4 ppm. 1 to 5 ppm is acceptable and 9 ppm is on the high side. 9 ppm would likely be safe to swim, but could be more of an irritant. Ideally, the level would be alllowed to come down to 5 ppm before swimmers are allowed to swim.

Does baking soda neutralize chlorine?

For instance, if you have used oxalic acid as the bleaching agent to remove the stains off your wooden article or furniture then you can use baking soda to neutralize it. But with chlorine bleach, it’s not a good idea to use baking soda.

Does apple cider vinegar neutralize chlorine?

Adding a few tablespoons full of vinegar to your wash will help neutralize chlorine, eliminate the smell, and even stop discoloration.

Does lemon juice remove chlorine from water?

Texas A&M School of Public Health researchers tackle the challenges associated with using chlorine to purify water. Researchers found that adding lemon to tap water before bringing it to a boil is effective at reducing the level of disinfection byproducts in drinking water.

How do you know if your pool has too much chlorine?

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 long does it take for chlorine to evaporate from a pool?

Direct sunlight breaks down chlorine. Without a stabilizer (cyanuric acid) in the water, as much as 90% of free available chlorine could be destroyed within just two or three hours.

Does heat burn off chlorine?

Yes, sunlight and heat do affect pool chlorine. Ultraviolet rays can reduce chlorine by up to 90 percent in two hours. As for temperature, warmer water tends to breed more bacteria, and so the pool’s chlorine gets used up faster and must be replenished more frequently.

Does sunlight reduce chlorine in pool?

The ultraviolet rays of the sun can reduce chlorine by up to 90 percent in two hours! And if it’s a hot day, warmer water tends to breed more bacteria, and so the pool’s chlorine gets used up faster and must be replenished more frequently.

Does UV light affect chlorine?

Alternatively, UV may act to destroy chlorine, reducing the residual in water. Monochromatic UV light was more effective in degrading monochloramine whereas polychromatic UV light was more effective in degrading free chlorine.

Does the sun affect chlorine levels?

That gorgeous sunlight you like to enjoy near the pool also affects the chlorine. The sun’s ultraviolet rays can cut down the chlorine concentration by 90% in as little as two hours. And on very hot days, the chlorine will deplete faster, becoming a cesspool for bacteria.

At what temperature does chlorine stop working?

The reason SWGs shut off below 60°F (or 16°C) is that the chlorinator cell needs to work harder to produce chlorine in colder water. This is because as the temperature of the water lowers, so does the conductivity of salt water. Most ions need a certain level of heat to separate and then rebind.

How long does chlorine stay in pool?

Most floating chlorinators can hold anywhere from two to eight weeks worth of chlorine, depending on conditions such as the season and your pool’s size. An automatic feeder works in a similar way, allowing it to mix with the pool water slowly and deliberately.

Does water temperature affect chlorine levels?

The warmer the water, the faster chlorine (and all other chemical reactions) can go, so it makes sense that chlorine gets used up faster in warmer water.

Does hot water use more chlorine?

Warmer water means more chlorine demand. This is not due to sunlight degradation of chlorine, though summertime does mean more hours of direct sunlight hitting an outdoor pool. The real reasons for higher chlorine demand are because both living and non-living contaminants are more prevalent in warmer water.

Do pools need more chlorine in summer?

As if the sun’s rays weren’t already taking enough of a toll on your chlorine levels, the accompanying heat is doing its own damage. On a hot summer day, every 10* over 80*F can double the amount of chlorine you need in your pool. This is because bacteria loves warm, wet environments.