Do you have a pool that is green and murky? Have you been struggling to get it clean? Maybe you’ve just moved into a new home with a pool and are unsure how to deal with it. Or, maybe you’ve had a pool for a while, but it’s never been properly maintained, and now it’s starting to turn green.

Either way, don’t worry! We can help you get your pool back to being crystal clear in no time. In this article, we’ll discuss why pools turn green, how to clean them, and some tips for preventing your pool from turning green in the future.

Why Is My Pool Green?

Having a pool is a great way to cool off during the summer, but it can be a hassle to keep it clean. A common issue that pool owners face is a green pool. Several factors, such as: can cause this

1. Algae Overgrowth

The most common cause of a green pool is algae overgrowth. Algae are single-celled organisms that thrive in wet environments, such as pools. They can be introduced into your pool in several ways, including rainwater, swimmer’s clothes, and even dirty pool brushes. Algae reproduce quickly and can quickly take over your pool if not treated.

2. pH Imbalance

Another common cause of a green pool is a pH imbalance. Water that is too alkaline or too acidic can cause the formation of algae. It can also make it difficult for chlorine to kill bacteria effectively.

3. Lack of Circulation

Another factor that can contribute to a green pool is a lack of circulation. If the water in your pool is not circulated properly, it can lead to stagnation and the formation of algae. Also, clean your pool filter regularly to ensure proper circulation.

Also, too much sun can also cause your pool to turn green. The chlorophyll in the algae absorbs the sunlight, which causes it to grow more quickly. Try to shade your pool during the hottest part of the day to prevent this.

4. Lack of Free Chlorine

Free chlorine is the most effective way to kill bacteria and algae in your pool. If your pool does not have enough free chlorine, it can lead to a green pool. Be sure to regularly test the chlorine levels in your pool and add more if needed.

5. Too Much Shade

While some shade is necessary to protect swimmers from the sun’s harmful rays, too much shade can lead to a green pool. Algae thrive in shady, dark areas. To prevent this, be sure to keep your pool well-ventilated and free of debris.

6. Poor Water Quality

Poor water quality is another common cause of a green pool. This can be caused by several factors, including high levels of calcium, magnesium, and other minerals. High levels of chloramines can also cause it. Be sure to have your pool water regularly tested to ensure it is of good quality.

Steps To Clear Up Green Pool

If you have a green pool, don’t despair! You can do several things to clear up the water and get back to swimming as soon as possible. With a little elbow grease and patience, your pool will look good as new in no time.

For example, you’ll need to determine the cause of the green water. If it’s due to algae, you can treat it with algaecide and brush the walls and floor of the pool with a stiff-bristled brush. To kill any remaining algae, you may also need to shock the pool with chlorine. If the green color is due to metals in the water, you can use a sequestering agent to bind them together so they can be filtered.

There are several other possible causes of green pool water, so let’s discuss them in detail to get your pool back to its original state.

1. Test and Balance Water pH

First, you will need to test and balance the pH of your pool water. The ideal pH level for pool water is between 7.2 and 7.8. If the pH level is too low, the water will be acidic, and if it is too high, it will be basic or alkaline.

You can use chemicals to adjust if the pH level is not within the ideal range. You can purchase a pool test kit from a local pool supply store or online.

To test the pH level, follow these steps:

  • Fill a clean glass with pool water.
  • Add the appropriate number of drops of pH testing solution, as directed by the kit instructions.
  • Compare the color of the water in the glass to the chart included with the kit.
  • If the pH level is too low or too high, you must adjust it. To raise the pH level, you can add a chemical called sodium carbonate, also known as soda ash.
  • You can add muriatic acid or sodium bisulfate to lower the pH level. You should test the pH level of your pool water at least once a week and adjust it as necessary.
  • Also, if your pool has a sand filter, you must clean it every two weeks. If it has a cartridge filter, you must clean it every four weeks. A dirty pool filter can cause the water in your pool to turn green.

2. Shock the Pool

Shocking the pool is a process of adding a large amount of chlorine to the water to kill off any algae or bacteria that may be present.

You must purchase pool shock from a local pool supply store or online. Follow the directions on the package for how much to add based on the size of your pool.

After adding the shock, run the filter for 24 hours and test the water again to ensure the chlorine levels are within the ideal range.

3. Apply an Algaecide

Using an algaecide is the most common way to kill and remove algae from your pool. There are many different types of algaecides on the market, so be sure to read the labels carefully to find one that will work best for your pool.

4. Vacuum the Pool

Once you have shocked the pool and the chlorine levels are back to normal, you will need to vacuum the pool to remove any dead algae or bacteria from the bottom.

You can either use a manual vacuum or an automatic pool cleaner. If you have an above-ground pool, you will need to purchase a vacuum hose that is long enough to reach the bottom of the pool.

5. Brush the Pool

In addition to vacuuming, you will also need to brush the walls and floor of the pool with a stiff brush. It is important to brush the entire pool, including all the nooks and crannies, to ensure that you are getting rid of all the algae.

6. Test the Water Quality

After vacuuming and brushing the pool, it is important to test the water quality. You will need to test for pH, alkalinity, and chlorine levels. If any of these levels are too high or too low, it can cause problems with the clarity of your pool water.

7. Filter the Pool

One of the best ways to keep your pool clean and free of algae is to filter it regularly. Depending on the size of your pool, you may need to filter it multiple times per day.

If you have a green pool, you will need to filter it more frequently. You may need to backwash the filter every few hours or so. Overall, swimming pool maintenance is essential and be sure to keep the chlorine levels in check to prevent green pool water.

Also Read: How to Fix Hot Tub Foam?

How Long Does it Take for a Green Pool to Clear Up?

It’s frustrating when you want to dip in your pool, and it’s turned green. Green pools are caused by algae, a type of plant that thrives in warm, moist environments. Algae can enter your pool in several ways, including rainwater or swimmers tracking it in from another body of water.

It is important to take action to clear up the problem as soon as possible. The longer you wait, the worse the algae will get and the more difficult it will be to get rid of.

So, how long does it take for a green pool to clear up? The answer depends on several factors, including the severity of the algae problem and the type of treatment you’re using. In most cases, you can expect significant results within a week. However, getting your pool back to its original condition may take longer.


Can Too Much Chlorine Make Pool Green?

Chlorine is a powerful disinfectant added to pools and hot tubs to help keep the water clean and safe to swim in. However, too much chlorine can make your pool water turn green.

This is because chlorine reacts with particles in the water like copper to oxidize, which are responsible for that tell-tale green tint. While they aren’t necessarily harmful to humans, they can cause skin and eye irritation and are not very effective at disinfecting the water.

Is It Safe To Swim In A Greenish Pool?

If your pool is only slightly green, it’s probably safe to swim in. However, if the water is very dark green or has a strong odor, it may be best to avoid swimming until you can get the problem under control.

Why Did My Pool Turn Green Overnight?

There are a few reasons why your pool may have turned green overnight. There may be too much chlorine in the water, or there could be an algae bloom. It’s also possible that copper pipes or other metals are leaching into the water, causing it to turn green.

Will Baking Soda Clear A Green Pool?

No, unfortunately, baking soda will not clear a green pool. It may worsen the problem by raising the water’s pH and making it more difficult to kill the algae.

Is It Safe To Swim In A Pool With Algaecide?

No, it is not safe to swim in a pool with algaecide. Algaecide is a chemical used to kill algae and can be harmful to humans if ingested. So, it’s best to wait until the algaecide has had a chance to do its job before swimming.

Can You Swim After Shocking A Pool?

Yes, you can swim after shocking a pool, but waiting until the chlorine levels have returned to normal is important. This can take anywhere from a few hours to a few days, depending on the size of the pool and the amount of chlorine needed to shock it.

How Do I Clear A Green Pool Fast?

If you’re looking to clear a green pool fast, the best thing to do is shock it. This will raise the chlorine levels in the water and kill the algae that are responsible for the green tint. You can also add an algaecide to help speed up the process.

How Much Chlorine Should I Add To My Pool?

The amount of chlorine you should add to your pool depends on the size of the pool and the level of contamination. If you’re not sure how much chlorine to add, it’s best to consult with a pool professional.

How Do I Prevent My Pool From Turning Green?

The best way to prevent your pool from turning green is to keep the chlorine levels at proper levels and to brush and vacuum the pool regularly. You should also ensure that there are no metal objects in the water that could leach into it and cause it to turn green.


In conclusion, dealing with a green swimming pool can be a frustrating experience. However, following the above steps, you can get your pool back to being blue in no time. Be patient, consistent, and vigilant, and you’ll swim in crystal clear water before you know it.

We hope you enjoyed this article. If you have any questions or comments, please contact us in the comment section below. We would be more than happy to help you out.

Last Updated: November 20, 2022 / Categories: Outdoor & Garden, Pool & Spa / 10.1 min read / Tags: , , , , /

About the Author: Brian Stilts

Brian Stilts

Homepeer is reader-supported. We may earn a commission through products purchased using links on this page. Learn more about our process here.

Subscribe To Receive The Latest News

Add notice about your Privacy Policy here.