Is Green Pool Water Safe for Swimming?

In order to maintain a healthy and safe swimming environment, it is important to keep your pool water clean. One of the most common problems pool owners face is green water. So, is green pool water safe for swimming? In this blog post, we will discuss the causes of green pool water and what you can do to remedy the situation.

What Causes Green Pool Water?

Most pool owners have experienced the frustration of dealing with green pool water at some point. While it may be tempting to simply drain the pool and start over, it’s important to understand what caused the problem in the first place.

There are several possible explanations for green pool water, but the most common is lack of chlorine. When chlorine levels are low, algae and bacteria can begin to grow in the water, causing it to turn green. This is why it’s so important to maintain proper chlorine levels in your pool.

What are the Different Kinds of Green Water?

There are actually a few different types of green water, each with its own cause. Here are the most common types of green pool water and what you can do to remedy them:

Light Green: This type of green water is usually the result of high pH levels or a high alkalinity. This is usually due to low pool sanitizer level, which allows algae to grow. The best way to remedy this is to test the pH and alkalinity levels and adjust accordingly.

light green water

Dark Green Water: The cause of dark green water is typically a high concentration of algae. This is usually harder to get rid of than light green water and may require multiple treatments. The best way to treat this is to shock the pool and then vacuum the algae out.

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dark green water

Black Green: This is the most severe type of green water. This can be very difficult to get rid of and will require a professional swimming pool service.

black green water

How Do You Clean a Green Pool?

Now that we’ve gone over the different types of green pool water and what causes them, let’s talk about how to clean a green pool.

Remove any large debris or materials from the pool

It’s important to remove any large debris or materials from the pool before you start the cleaning process. This will make it easier to vacuum and shock the pool later on.

Test the pH and alkalinity levels

To clean a green pool, you’ll need to start by testing the pH and alkalinity levels. You can use a pool test kit to do this. Adjust the levels as needed until they are within the proper range. The ideal pH level for a pool is between seven and eight. It’s best to shoot for the 7.2 to maintain proper chlorine levels.

Shock the pool

Shocking the pool is a process of adding a high concentration of chlorine to the water in order to kill any algae or bacteria. This is usually done with liquid chlorine, but you can also use granular chlorine. The amount of shock you’ll need will depend on the size of your pool and the severity of the green water.

Filter the pool

Now that you’ve shocked the pool, you’ll need to filter it to remove any algae or bacteria that are still present. Run the filter for 24 hours to ensure that all of the contaminants have been removed.

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Test the chlorine levels

After you’ve filtered the pool, it’s important to test the chlorine levels. Adjust the levels as needed to ensure that they are within the proper range. This will help prevent the green water from returning.


We hope this blog post has been helpful in understanding green pool water and how to clean it. Remember, it’s important to maintain proper chlorine levels in your pool to prevent algae and bacteria from growing. If you have any questions, feel free to contact us. We’re always happy to help!

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