Cloudy Pool After Killing Algae: A Step-by-Step Guide To Clear Up a Cloudy Pool

By Algal Web

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A clear and sparkling pool is every pool owner’s dream. The sight of crystal-clear water inviting you to take a refreshing dip is an idyllic vision.

However, sometimes it is not easy to maintain a clean pool, especially when you have to deal with algae. Algae can be a common problem in swimming pools, and if left untreated, it can turn your pool into a green and murky mess.

But what happens when you finally succeed in killing the algae, only to find that your pool has turned cloudy?

Cloudy pool water can be a frustrating and discouraging experience for any pool owner. After putting in all the effort to get rid of the algae, a cloudy pool can make you feel like you have taken one step forward and two steps back.

However, the good news is that this is a common problem and can be fixed.

In this article, we will discuss what you can do to clear up a cloudy pool after killing algae, so you can enjoy the clear and inviting pool you have always wanted.

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Importance of Having a Clear Pool

A clear pool not only looks good but also ensures that the water is safe for swimming. A cloudy pool can be a breeding ground for bacteria, making the water unsafe to swim in.

Additionally, a cloudy pool can be unappealing to swimmers, leading to a decline in usage. Therefore, it is essential to keep your pool clear at all times.

Test the Water

Before taking any action, it is crucial to test the water. This will help you understand the chemical balance of the water, which is necessary for maintaining a clear pool.

You can purchase a pool water testing kit from your local pool supply store or hire a professional pool service to do it for you. The ideal water balance should be:

  • pH: 7.2-7.6
  • Total alkalinity: 80-120 ppm
  • Calcium hardness: 200-400 ppm
  • Free chlorine: 1-3 ppm
  • Cyanuric acid: 30-50 ppm

Clean the Filter

A clean filter is essential for maintaining a clear pool. The filter is responsible for removing debris, dirt, and other particles from the water. If the filter is clogged, it will not work effectively, resulting in a cloudy pool.

There are three types of filters; sand, cartridge, and DE. The cleaning process for each filter is different.

For a sand filter, you need to backwash it. This process involves reversing the flow of water through the filter, which dislodges and removes any debris stuck in the sand.

For a cartridge filter, you need to remove the filter element and hose it down with a high-pressure water spray. This will remove any debris or dirt stuck in the filter element.

For a DE filter, you need to backwash it, just like a sand filter. However, after backwashing, you need to add DE powder to the filter.

DE powder helps trap smaller particles and debris that may have passed through the filter.

Brush and Vacuum the Pool

Brushing and vacuuming the pool is essential for removing any dead algae and other debris that may have settled on the bottom of the pool.

Brushing the pool walls and floor helps dislodge any dirt or debris that may be stuck to them. After brushing, you need to vacuum the pool. There are two types of pool vacuums, manual and automatic.

For a manual pool vacuum, you need to attach the vacuum head to the telescopic pole, attach the hose to the vacuum head, and connect the other end of the hose to the skimmer. Turn on the pump, and the vacuum will start working.

For an automatic pool vacuum, you need to connect it to the skimmer or a dedicated suction line. The vacuum will move around the pool, cleaning it automatically.

The frequency of brushing and vacuuming depends on the amount of debris in the pool. If you have a lot of trees around your pool, you may need to brush and vacuum the pool more frequently.

Shock the Pool

Shocking the pool involves adding a high dose of chlorine to the water to kill any bacteria, algae, or other microorganisms that may be present.

Shocking the pool is necessary after killing algae to prevent it from coming back and to clear any remaining debris. Shocking also helps to oxidize and remove any organic contaminants in the water.

To shock the pool, you will need to first test the water to determine the correct amount of shock needed. Follow the instructions on the shock product carefully, and add it to the pool water in the evening, when the sun is down.

Be sure to run the pump and filter for at least 8 hours after the shock to circulate the water and distribute the shock evenly.

Run the Pump and Filter

Running the pump and filter is essential for maintaining clear pool water. The pump circulates the water, while the filter removes any debris or particles that may be present.

After brushing and vacuuming the pool, be sure to run the pump and filter for at least 8 hours a day, or as recommended by the manufacturer. This will help to keep the water clean and clear.

In addition, you can also run the pump and filter continuously for 24-48 hours after shocking the pool to help clear any remaining debris and contaminants.

Wait and Test Again

After taking all the necessary steps, you will need to wait and test the water again. It may take a few days for the water to clear up completely, so be patient.

Test the water again to ensure that the chemical balance is correct and the water is safe for swimming.


Maintaining a clear and sparkling pool can be a challenge, especially when dealing with algae. However, by following the steps outlined in this article, you can successfully clear up a cloudy pool after killing algae.

Remember to regularly test the water, clean the filter, brush and vacuum the pool, shock the pool, run the pump and filter, and be patient.

A combination of these steps will help you to maintain a clean and inviting pool throughout the swimming season.

It’s important to note that prevention is always better than cure. Regular pool maintenance and proper chemical balancing can prevent algae growth and other pool problems before they become major issues. By practicing good pool maintenance habits, you can ensure that your pool stays clear and safe for you and your family to enjoy.

In summary, don’t let a cloudy pool discourage you. With a little patience and effort, you can turn a cloudy pool into a clear and inviting oasis.

Follow the steps outlined in this article, and enjoy a safe and sparkling pool all summer long.

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  3. How To Get Rid Of Pool Algae Quickly
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  5. Pool Algae Stain Remover: Say Goodbye to Unsightly Algae Stains in Your Pool