how much algaecide to put in pool for winter

How Much Algaecide to Put in Pool for Winter

As the winter season approaches, one important aspect of pool maintenance is ensuring that your pool remains clean and algae-free during the colder months. Algaecide plays a crucial role in preventing algae growth and maintaining the water’s clarity throughout the winter.

When it comes to determining the correct amount of algaecide to use in your pool for winter, there are a few factors to consider:

  1. Pools Size: The size of your pool is the primary factor in determining the amount of algaecide needed. Larger pools will require more algaecide, whereas smaller pools will need lesser amounts.
  2. Manufacturer’s Recommendations: It is essential to carefully read and follow the instructions provided by the manufacturer of the algaecide product you are using. Manufacturers usually provide specific guidelines on the recommended dosage based on pool size and volume.
  3. Pool Condition: If your pool tends to have recurring algae problems or if there is already visible algae growth, you may need to increase the dosage accordingly. In such cases, it’s advisable to consult with a pool maintenance professional or seek advice from your algaecide manufacturer.
  4. Maintaining Proper pH Levels: Before adding algaecide, it is crucial to ensure that your pool’s pH levels are within the recommended range (between 7.2 and 7.6). Proper pH levels help the algaecide work effectively and reduce the chances of algae growth during winter.

Once you have taken these factors into account, a general guideline for the amount of algaecide to put in your pool for winter is approximately 1 quart (32 ounces) of algaecide per 25,000 gallons of water. However, it’s important to note that this is just a rough estimate, and your specific pool requirements may vary.

Step-by-Step Guide to Adding Algaecide in Your Winter Pool

  1. Measure your pool’s water volume: It is crucial to know the accurate water volume of your pool to determine the correct algaecide dosage.
  2. Follow the manufacturer’s instructions: Carefully read the instructions provided by the manufacturer of the algaecide product you are using. Observe any specific guidelines they have mentioned.
  3. Fill a bucket with pool water: To dilute the algaecide properly, fill a clean bucket with some pool water. This step ensures the algaecide is evenly distributed in the pool.
  4. Add the recommended amount of algaecide: Pour the calculated amount of algaecide into the bucket containing pool water and stir it gently to dissolve the algaecide completely.
  5. Pour the diluted algaecide in the pool: Slowly pour the diluted algaecide mixture into the pool while walking around the edges. This will help distribute the solution evenly throughout the water.
  6. Run the pool pump: Turn on your pool pump and let it run for a few hours to circulate the algaecide and mix it thoroughly with the pool water.
  7. Monitor and maintain: Throughout the winter, regularly monitor your pool’s water chemistry and ensure pH levels remain within the recommended range. Additionally, always follow any maintenance guidelines provided by the algaecide manufacturer.


To keep your pool clean and free from algae during winter, adding the right amount of algaecide is crucial. Consider factors such as pool size, manufacturer’s recommendations, pool condition, and maintaining proper pH levels. Remember to read and follow the instructions provided by the algaecide manufacturer for best results. By taking these measures, you can enjoy a hassle-free pool opening in the spring, ensuring a clean and inviting swimming environment for the upcoming season.

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