How To Clean a Green Pool Without Chemicals Like a Pro

A crystal clear pool surrounded by eco-friendly cleaning tools

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Having a green pool can be a nightmare for any homeowner. It’s not just an eyesore, but it can also be a breeding ground for harmful bacteria. Most people resort to using harsh chemicals to clean their pools, but these can be harmful to the environment and can cause skin and eye irritation. But don’t worry, there are ways to clean a green pool without using chemicals. In this guide, we will show you how to do it like a pro.

Understanding Why Your Pool Turns Green

Before we dive into the cleaning process, it’s important to understand why your pool turns green in the first place. This will help you prevent it from happening again in the future.

The main culprit behind a green pool is algae. These microscopic organisms thrive in warm, stagnant water and can multiply rapidly, turning your pool water green in a matter of days. Algae growth is usually triggered by a lack of proper pool maintenance, particularly inadequate filtration and imbalanced water chemistry.

Another reason your pool may turn green is due to the presence of metals, particularly copper. This can happen if you use a copper-based algaecide or if your pool equipment is corroding.

How To Clean a Green Pool Without Chemicals

Now that we understand why pools turn green, let’s get into how to clean them without using chemicals. The process involves several steps, which we will outline below.

Step 1: Remove Debris

The first step in cleaning a green pool is to remove any visible debris using a pool net. This includes leaves, twigs, insects, and any other objects that may have fallen into the pool.

Removing debris not only makes the cleaning process easier but also prevents the debris from clogging your pool’s filtration system. It’s a simple yet crucial step that shouldn’t be skipped.

Step 2: Brush and Vacuum the Pool

After removing the debris, the next step is to brush the sides and bottom of the pool to loosen any algae or dirt. Use a pool brush for this task. Make sure to brush all areas, including the corners and behind the pool ladder, where algae tend to hide.

Once you’ve brushed the pool, vacuum it to remove the loosened algae and dirt. If your pool is heavily infested with algae, you may need to vacuum it multiple times until the water starts to clear up.

Step 3: Adjust the Water Chemistry

Even though we’re not using chemicals to clean the pool, it’s still important to maintain balanced water chemistry. This helps prevent algae growth and keeps the water safe for swimming.

Test the pool water using a pool test kit. You should aim for the following levels:

  • pH: 7.2 – 7.6
  • Alkalinity: 80 – 120 ppm
  • Calcium hardness: 200 – 400 ppm

If the water chemistry is off, adjust it using natural methods. For example, you can use baking soda to increase alkalinity, and muriatic acid to lower pH and alkalinity.

Step 4: Run the Filtration System

Once the water chemistry is balanced, run your pool’s filtration system. The filter will help remove any remaining algae and dirt from the water.

Keep the filtration system running until the water is clear. This may take several days, depending on the severity of the algae infestation.

Preventing Your Pool From Turning Green Again

After you’ve successfully cleaned your green pool, the next step is to prevent it from turning green again. Here are some tips:

  • Regularly test and adjust the water chemistry.
  • Run the filtration system daily.
  • Brush and vacuum the pool weekly.
  • Keep the pool area clean and free of debris.
  • Use a pool cover when the pool is not in use.

By following these tips, you can maintain a clean and clear pool without the need for harsh chemicals. Remember, prevention is always better than cure.


Cleaning a green pool without chemicals may seem like a daunting task, but it’s definitely doable. It requires some time and effort, but the result is a clean, safe, and eco-friendly pool that you and your family can enjoy.

So, the next time your pool turns green, don’t reach for the chemicals. Instead, follow the steps outlined in this guide to clean it naturally and effectively.

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