Pool Closing: Essential Steps for Pool Maintenance

As the leaves start to fall and the temperature begins to drop, it’s a clear sign that the swimming season is coming to an end. But before you say goodbye to your pool for the winter, there’s one crucial task that needs to be done – winterizing your pool.

Winterizing, or closing your pool, is an essential part of pool maintenance that ensures your pool remains in good condition during the off-season and is ready for use when the warm weather returns. This process can seem daunting, especially if it’s your first time. But don’t worry, we’ve got you covered.

In this comprehensive guide, we’ll walk you through the essential steps for pool maintenance during the off-season. From cleaning and balancing the water chemistry to covering the pool, we’ll provide you with all the information you need to properly close your pool for the winter. So, let’s dive in!

How do I close my pool for the winter?

To close your pool for the winter, you need to follow these steps:

  • Clean and balance the water chemistry
  • Add shock and algaecide
  • Lower the water level
  • Drain and winterize the equipment and plumbing
  • Cover the pool with a safety or winter cover

Clean and Balance the Water Chemistry

The First Step: Ensuring a Clean and Balanced Pool

Before you even think about covering your pool for the winter, the first and most crucial step is to ensure that your pool is clean and the water chemistry is balanced. This step is vital as it helps to prevent the growth of algae and bacteria during the off-season, which can cause significant damage to your pool.

Start by removing any debris from your pool using a leaf skimmer. This includes leaves, bugs, and any other foreign objects that might have found their way into your pool. Once that’s done, give your pool a thorough cleaning. Brush the sides and bottom of the pool to dislodge any dirt or algae, and then vacuum to remove these particles from the water.

Next, it’s time to balance the water chemistry. This involves testing the water for its pH, alkalinity, and calcium hardness levels, and then adjusting these levels as necessary. The ideal ranges are:

  • pH: 7.2 – 7.6
  • Alkalinity: 80 – 120 ppm
  • Calcium Hardness: 200 – 400 ppm
  • Chlorine: 2.0 – 4.0 ppm

Balancing the water chemistry not only helps to keep your pool clean but also optimizes the effectiveness of the winterizing chemicals that you’ll be adding in the next step. Remember, a clean and balanced pool is the first step towards a successful pool closing process.

Add Shock and Algaecide

Protect Your Pool: The Importance of Shock and Algaecide

Once your pool is clean and the water chemistry is balanced, the next step is to add shock and algaecide to your pool. These chemicals play a crucial role in maintaining the cleanliness of your pool during the off-season.

Shock, also known as pool sanitizer, is a type of chlorine that is used to kill bacteria and other microorganisms in the pool. It’s called “shock” because it rapidly raises the chlorine level in the pool, effectively “shocking” the water and killing off any bacteria or algae present. To shock your pool, follow the instructions on the product packaging. Generally, you’ll want to add the shock to your pool in the evening, when the sun is down, to prevent the sun from burning off the chlorine.

After shocking your pool, the next step is to add an algaecide. As the name suggests, algaecide is a chemical that prevents the growth of algae in your pool. Algae can be a big problem during the winter months, as it can grow rapidly in untreated water and cause significant damage to your pool. By adding an algaecide, you’re taking a proactive step to prevent this problem before it starts.

When adding these chemicals to your pool, remember to always follow the manufacturer’s instructions. Also, be sure to wear protective clothing and goggles to protect yourself from any potential chemical splashes. With the right use of shock and algaecide, you’re well on your way to maintaining a clean and clear pool during the off-season.

Lower the Water Level

Preparing for Winter: Lowering the Pool Water Level

After your pool is clean and chemically balanced, the next step in the winterizing process is to lower the water level. This is an important step, especially if you live in an area where temperatures drop below freezing during the winter months.

When water freezes, it expands. If your pool is filled to the top, the expanding water could potentially damage your pool’s walls or skimmer. To prevent this, you’ll need to lower the water level below the skimmer mouth. For most pools, this means reducing the water level by 12 to 18 inches.

You can lower the water level using your pool’s pump or a submersible pump. If you’re using your pool’s pump, be sure to set it to the “waste” or “drain” setting. If you’re using a submersible pump, simply place it in the pool, connect a discharge hose, and let it do its job.

Remember, you don’t want to completely drain your pool – this can cause other problems, like causing your pool to lift out of the ground. The goal is to simply lower the water level to a safe level for the winter months. By doing so, you’re protecting your pool from potential freeze damage and setting the stage for the next steps in the winterizing process.

Drain and Winterize the Equipment and Plumbing

Safeguarding Your Equipment: Draining and Winterizing

With the water level lowered, it’s now time to turn our attention to the pool equipment and plumbing. These components are crucial to the operation of your pool, and proper winterization is key to ensuring they survive the winter unscathed.

Start by draining water from your pool pump, filter, and heater. Most pool equipment has a drain plug or valve for this purpose. Be sure to open these and let the water flow out. If your pool has a heater, it’s also a good idea to blow out the lines using a shop vac to ensure all water is removed.

Next, turn your attention to the pool plumbing. If water is left in the pipes and it freezes, it can cause the pipes to crack. To prevent this, use an air compressor or a wet/dry vac to blow out the lines. Once the lines are clear, plug the return lines to keep water out. For added protection, consider using swimming pool antifreeze. This special antifreeze is designed for pool plumbing and can provide an extra layer of protection against freezing temperatures.

Finally, don’t forget about any pool accessories like ladders, rails, or slides. These should be removed, cleaned, and stored in a safe place for the winter.

By taking the time to properly drain and winterize your pool equipment and plumbing, you’re helping to ensure a smooth pool opening when the warm weather returns.

Cover the Pool

The Final Step: Covering Your Pool

The final step in the pool closing process is to cover your pool. A pool cover provides a physical barrier that keeps out leaves, debris, and wildlife. It also helps to prevent algae growth by blocking sunlight, and it can provide an additional layer of protection against freezing temperatures.

When choosing a pool cover, look for one that is strong, durable, and designed for winter use. It should be large enough to cover your entire pool, with some overlap around the edges for secure anchoring.

To install the cover, spread it over the pool and secure it in place using water bags or weights. If your pool is an in-ground model, the cover can be anchored to the deck using springs and anchors. For above-ground pools, the cover is usually secured with a cable and winch system.

Once the cover is secure, check it for any rips or tears. If you find any, repair them with a pool cover patch kit to prevent them from getting worse.

Covering your pool is the final step in the winterizing process, but it’s one of the most important. A properly installed pool cover can protect your pool from the harsh winter elements and make your job easier when it’s time to open the pool again in the spring.

And with that, your pool is now ready for winter. While it may seem like a lot of work, taking the time to properly close your pool for the winter can save you a lot of time, money, and headaches when the swimming season rolls around again. So, until then, rest easy knowing your pool is well-protected and ready for the off-season.


Here are some common questions related to pool closing:

Question: Should you chlorinate pool before closing?
Answer: Yes, you should chlorinate your pool before closing it for the winter. This is typically done by adding a shock treatment, which is a high dose of chlorine. The shock treatment kills bacteria and other microorganisms in the pool, helping to keep the water clean during the off-season.

Question: How many bags of shock do you need to winterize a pool?
Answer: The amount of shock you need to winterize a pool depends on the size of your pool. As a general rule, you should use one pound of shock treatment for every 10,000 gallons of water. However, you should always follow the manufacturer’s instructions on the shock treatment packaging to ensure you’re using the correct amount.

Question: When should I close my pool?
Answer: The best time to close your pool is when the water temperature is consistently below 65 degrees Fahrenheit. Closing your pool too early while the weather is still warm can lead to algae growth, while closing too late can expose your pool to potential freezing damage.

Question: How long should I run my pump before closing my pool?
Answer: After adding your winterizing chemicals, you should run your pool pump for one full cycle, which typically lasts about 4-12 hours. This ensures that the chemicals are well distributed throughout the pool and that the water is properly filtered before you close the pool.

Question: How do I winterize a saltwater pool?
Answer: Winterizing a saltwater pool involves similar steps as a regular pool, with a few additional tasks. You’ll need to turn off and clean your saltwater generator, and check the salt level in your pool. It’s also recommended to add a sequestering agent to your pool water. This helps to prevent metal stains during the winter months when the pool is not in use.


Closing your pool for the winter might seem like a daunting task, but with the right guidance and a bit of effort, it’s a task that’s well within your reach. By following the essential steps we’ve outlined – from cleaning and balancing your pool water, adding shock and algaecide, lowering the water level, draining and winterizing your equipment and plumbing, to finally covering your pool – you’re not only protecting your pool from potential winter damage but also setting the stage for a smooth and hassle-free pool opening when the warm weather returns.

Remember, each step in the pool closing process plays a crucial role in maintaining the longevity and functionality of your pool. So, take the time to do it right. And when the swimming season rolls around again, you’ll be glad you did.

As you prepare for the off-season, it’s also a great time to review your pool care products. Having the right tools and products on hand can make the pool closing process much easier and more effective. Check out our comprehensive guide on Pool Care Products to ensure you’re well-equipped for all your pool maintenance needs.

Until then, rest easy knowing your pool is well-protected and ready for the off-season. Here’s to a successful pool closing and a future of continued pool enjoyment!

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