How to Clear Cloudy Swimming Pool Water?

How to Clear Cloudy Swimming Pool Water_

A swimming pool is a great place to cool off and have fun on a hot summer day, but cloudy water can ruin the experience. Not only is it unappealing to swim in, but it can also be a safety hazard if you can’t see the bottom of the pool. In this article, we’ll go over the common causes of cloudy pool water and provide step-by-step instructions for how to fix it.

Proper water balance is key

Before we dive into the solutions, it’s important to understand that maintaining proper water balance is crucial for preventing cloudiness. This means keeping the pH, total alkalinity, and calcium hardness within the recommended range for your pool. If any of these levels are off, it can cause the water to become cloudy.

Testing the water chemistry is easy and can be done with test strips or a digital testing kit. These can be purchased at a pool supply store or online. Once you have your results, you can determine the necessary adjustments to bring the levels back into balance. If you’re not sure how to interpret the results or make the adjustments, a pool professional can help.

Cleaning the filter

Your pool filter plays a vital role in keeping the water clear by removing dirt and debris. Over time, the filter can become clogged, which can lead to cloudy water. That’s why it’s important to clean and maintain your filter on a regular basis.

The specific steps for cleaning your filter will depend on the type you have. Sand filters and DE (diatomaceous earth) filters can be backwashed, which involves reversing the flow of water through the filter to flush out dirt and debris. Cartridge filters, on the other hand, should be removed and hosed off with a garden hose.

In addition to backwashing or hosing off the filter, it may also be necessary to chemically clean it. This involves using a filter cleaner or soaking the filter in a solution of muriatic acid and water. Again, the specific instructions will depend on the type of filter you have, so be sure to consult the manufacturer’s instructions or a pool professional if you’re not sure.

Shock treatment

If cleaning the filter and adjusting the water chemistry doesn’t improve the clarity of the water, you may need to shock the pool. Shocking the pool involves adding a high dose of chlorine or another oxidizing agent to eliminate contaminants and clarify the water.

To shock the pool, you’ll need to calculate the correct amount of shock based on the size of the pool and the current chlorine level. It’s important to follow the manufacturer’s instructions and handle the shock properly, as it can be harmful if ingested or inhaled. Once the shock has been added, it’s recommended to wait at least 24 hours before swimming to give it time to work.

Water clarifiers and other chemicals

If the water is still cloudy after shocking the pool, there are a few other products you can try. Water clarifiers, also known as flocculants, work by coagulating small particles together so they can be more easily removed by the filter. There are different types of clarifiers available, such as enzyme clarifiers and polymer clarifiers, so be sure to choose the one that’s best suited for your pool.

In addition to clarifiers, there are other chemicals that can help clarify the water. These include algaecides, which kill algae, and phosphates, which can prevent the growth of algae. As with any chemical, it’s important to follow the manufacturer’s instructions and use caution when handling them.

Other causes of cloudy water

Cloudy water can be caused by more than just poor water balance and a dirty filter. The algae growth can also contribute to cloudiness, as can plumbing issues such as leaks or clogged pipes.

To prevent algae growth, it’s important to maintain a proper chlorine level and circulate the water regularly. If you suspect you have an algae problem, using an algaecide as directed can help eliminate it.
Plumbing issues can be more difficult to diagnose and resolve. If you suspect a problem with your pool’s plumbing, it’s best to consult a pool professional.


In summary, clearing cloudy pool water requires a combination of proper water balance, regular filter maintenance, and possibly shock treatment and other chemicals. By following these steps and being vigilant about testing and maintaining the water chemistry, you can keep your pool crystal clear and safe for swimming.