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Pool Closing Kit: The Ultimate Guide

Updated: Aug 29, 2023

Pool owners must prepare their pools for the winter season to prevent costly damage and ensure their pools are in good condition when they reopen. A pool closing kit is an essential tool for winterizing a pool. It contains all the necessary chemicals and equipment needed to protect a pool from the harsh winter elements.

From understanding the different types of kits available to the chemicals they contain, this guide covers everything a pool owner needs to know about closing their pool for the winter.

pool closing

With the right pool closing kit, pool owners can protect their investment and ensure their pool is ready to use when the warmer weather returns. This guide will help pool owners make an informed decision about which kit to choose and how to properly winterize their pool.

Understanding Pool Closing Kits

Pool closing kits are an essential part of winterizing a swimming pool, protecting it from damage during the off-season. These kits are designed to include all the necessary chemicals and accessories to make closing a pool as easy and efficient as possible.

Pool closing kits typically contain a variety of chemicals that help balance the water chemistry and prevent algae growth during the winter months. These chemicals may include shock treatments, algaecides, and stain preventers. Some kits also include products to help protect pool equipment, such as antifreeze for plumbing lines and cover cleaner to prevent damage to the pool cover.

When selecting a pool closing kit, it is important to consider the size of the pool and the type of pool you have, as different types of pools may require different chemicals and accessories. It is also important to follow the instructions carefully to ensure that the chemicals are added in the correct order and in the correct amounts.

Pool closing kits are widely available in the pool and spa industry, and can be purchased online or at local pool supply stores. It is important to choose a reputable brand and to check the expiration date of the chemicals included in the kit.

In conclusion, understanding pool closing kits is essential for anyone who owns a swimming pool and wants to protect it during the winter months. By selecting the right kit and following the instructions carefully, pool owners can ensure that their pool is properly winterized and ready for use when the warmer weather returns.

Importance of Winterizing Your Pool

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Winterizing your pool is an essential step to ensure that your pool is protected during the colder months. When the temperature drops, water in the pool can freeze and cause damage to the pool's plumbing and equipment. Winterizing your pool involves a series of steps that help protect your pool from the harsh winter weather.

A pool closing kit is an easy way to get all of the chemicals you need to make your pool's winter nap as uneventful as possible. The kit will typically include chemicals to balance the water, prevent algae growth, and protect the pool's plumbing and equipment.

Finally, you will need to cover your pool with a winter cover. A winter cover will help keep debris out of the pool and prevent the growth of algae. It will also help protect the pool from the harsh winter weather.

Choosing the Right Pool Closing Kit

When it comes to closing a pool for the winter, a pool closing kit is a must-have. Here are some tips to help you choose the right pool closing kit for your needs:

Consider Your Pool Type

The first thing to consider when choosing a pool closing kit is the type of pool you have. There are different kits available for above ground and in-ground pools, as well as for different pool surfaces.

Look for Comprehensive Kits

When shopping for a pool closing kit, look for one that includes all the chemicals you need to properly winterize your pool. This includes shock, algaecide, and a winterizing chemical. Some kits also include a cover, air pillow, and other accessories that can be helpful when closing your pool.

Consider the Size of Your Pool

Make sure to choose a kit that is appropriate for the size of your pool. Kits are typically designed for pools of a specific size, so be sure to check the label before making a purchase. Using a kit that is too small for your pool can result in inadequate winterization, while using a kit that is too large can be a waste of money.

Round Up the Right Kit

If you have a round above ground pool, you'll want to choose a kit that is specifically designed for that shape. These kits typically include a winterizing chemical, shock, and an algaecide, as well as a cover and other accessories.

Overall, choosing the right pool closing kit requires careful consideration of your pool type, size, and the contents of the kit. By taking the time to choose the right kit, you can ensure that your pool is properly winterized and protected until the next swimming season.

Chemicals in Pool Closing Kits

pool chemicals

Even in the coldest months, your pool requires care. Discover the best practices for maintaining your pool in cold weather to ensure it's ready for use when summer returns.

Pool closing kits are essential for maintaining the health of your pool during the winter months. These kits contain a variety of chemicals that help prevent algae growth, stains, and scale buildup. Here are some of the common chemicals found in pool closing kits:


Chlorine is a common chemical used to sanitize swimming pools. It helps kill bacteria and other harmful contaminants that can cause illness. When closing your pool, it's important to add enough chlorine to maintain a residual level of 1-3 ppm (parts per million) in the water. This will help prevent the growth of algae and other microorganisms. We recommend In The Swim 3 Inch Stabilized Chlorine Tablets.


Algaecide is a chemical that helps prevent the growth of algae in your pool. It's important to use an algaecide specifically formulated for winterizing your pool, as it will be more effective at preventing algae growth during the colder months. Most pool closing kits include a winter algaecide that can be added to the water before closing the pool. We recommend Clorox Pool&Spa Pool Algaecide.


An oxidizer is a chemical that helps break down organic matter in your pool. This includes things like leaves, dirt, and other debris that can accumulate in the water. A non-chlorine oxidizer is typically used when closing a pool, as it won't affect the chlorine levels in the water. We recommend SpaGuard Spa Shock-Oxidizer.


Bromine is an alternative to chlorine that can be used to sanitize swimming pools. It's less harsh on the skin and eyes than chlorine, making it a good choice for those with sensitive skin. However, it's not as effective at killing bacteria and other microorganisms as chlorine. We recommend Clorox Spa Bromine Tablets.

Other Chemicals

In addition to the chemicals listed above, pool closing kits may also include other chemicals like stain and scale treatment or pH balancers. These chemicals help prevent stains and buildup on the walls and floor of your pool, as well as maintain a proper pH balance in the water.

When using a pool closing kit, it's important to follow the instructions carefully and use the recommended amount of each chemical. This will help ensure that your pool stays clean and healthy throughout the winter months.

Stain Prevention

To prevent staining during the winter, it's important to use a stain and scale prevention product in the pool closing kit. These products can help prevent stains from forming and keep the pool looking its best.

Stain & Scale Pill

Another option for preventing stains and scaling is to use a stain and scale pill. These pills are designed to slowly dissolve over time and release chemicals that can help prevent staining and scaling. They are easy to use and can be added to the skimmer basket or directly to the pool.

Balancing your pool's chemicals before closing it for the season is crucial. Use our pool chemical calculator to ensure your pool is properly prepared for the off-season.

Additional Tips for Pool Closing

pool cover

Oxidize the Pool

Before closing the pool, it is important to shock the water with an oxidizing agent. This will help to eliminate any remaining contaminants and bacteria in the water. It is recommended to use a non-chlorine shock for vinyl liner pools to avoid any discoloration or damage to the liner.

Blow Out Plumbing Lines

To prevent any water from freezing and damaging the plumbing lines, it is important to blow out the lines before closing the pool. This can be done using a high-powered blower or air compressor. Start at the farthest point from the pump and work your way back to ensure all water is removed from the lines.

Protect the Vinyl Liner

Vinyl liners are delicate and can be easily damaged if not handled with care. When closing the pool, be sure to remove all debris from the pool and vacuum the liner. It is also recommended to use a winterizing chemical specifically designed for vinyl liners to protect against damage during the winter months.

Elbow Grease

Closing a pool requires some elbow grease. Be sure to clean the pool thoroughly before closing, including brushing the walls and floor and skimming the surface. This will help to prevent any buildup of debris and algae during the winter months.

Skimmer Line

It is important to properly winterize the skimmer line to prevent any damage from freezing water. This can be done using a skimmer guard or by adding pool closing chemicals directly to the skimmer.

Saltwater Pools

If you have a saltwater pool, it is important to follow the manufacturer's instructions for winterizing the pool. This may include adding additional chemicals to the water or adjusting the salt levels.

By following these additional tips, pool owners can ensure their pool is properly closed and protected during the winter months.

Frequently Asked Questions

What chemicals are needed to properly close a pool?

To properly close a pool, you will need a pool closing kit that includes the necessary chemicals. The kit should include shock, algaecide, and winterizing chemicals. Shocking the pool before closing it helps to kill any remaining bacteria and algae. Algaecide should be added to prevent any algae growth during the winter. Winterizing chemicals are used to protect the pool from the harsh winter weather.

How do I winterize my above ground pool?

To winterize an above ground pool, you should start by cleaning the pool thoroughly. Remove any debris and vacuum the pool. Then, lower the water level to just below the skimmer. Add winterizing chemicals to the pool and run the pump for a few hours to circulate the chemicals. Finally, cover the pool with a winter cover.

What is the best way to prepare my pool for winter?

Remove any debris and vacuum the pool. Then, balance the water chemistry and add winterizing chemicals. Lower the water level to just below the skimmer and cover the pool with a winter cover. It is also important to store any pool equipment, such as ladders and skimmers, in a dry place.

When should I close my pool for the winter?

The best time to close your pool for the winter depends on your location and climate. In general, it is best to close the pool before the first frost. This is usually in late September or early October. Closing the pool too early can lead to algae growth, while closing it too late can cause damage to the pool from freezing temperatures.

Do I need to add antifreeze to my pool when closing it?

Antifreeze is not necessary for most pools when closing them for the winter. However, if you live in an area with extremely cold temperatures, you may want to add antifreeze to the pool's plumbing lines to prevent them from freezing and cracking.

What is the purpose of shocking my pool before closing it?

Shocking the pool before closing it helps to kill any remaining bacteria and algae in the water. This is important because bacteria and algae can continue to grow in the pool during the winter months, even when the pool is not being used. By shocking the pool, you are ensuring that the water is clean and clear when you open the pool in the spring.


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