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As any pool owner knows, closing your pool for the cooler months ahead is an important part of pool maintenance. Whether you’re a first-time pool owner or an experienced veteran, you might be wondering what chemicals you should use to close your pool. Fortunately, pool closing kits are available to provide you with the exact chemicals you need in the right proportions to safely close your pool.

Which Pool Closure Chemicals Should I Purchase?

For most pool owners, purchasing a pool closing kit is their best option. These kits typically contain all the necessary components to close your pool properly and without wasting valuable resources. Some of the most important components to look for in a pool closing kit are listed below.


Chlorine is an essential chemical for any pool owner and should be at the center of your pool closing checklist. Chlorine helps to keep your pool sanitized and free from bacteria, algae, and other contaminants throughout the year. Additionally, chlorine should be used in significant amounts immediately before closing the pool to ensure all contaminants are eliminated before the pool is covered.


Algaecide is another important chemical for pool maintenance and should be used regularly throughout the year. Before closing your pool, however, it is wise to add an algaecide to help prevent any algae from forming over the course of the winter. Algaecide typically comes in liquid form and is available in most pool closing kits.

pH Increaser/Decreaser

In order to ensure that the water in your pool is properly balanced, you should use a pH increaser and pH decreaser. This will help to maintain the correct alkalinity in the water, making it safe to swim in when the pool is opened in the spring. A pH increaser/decreaser is typically included in pool closing kits, so be sure to check before making a purchase.

Shock Treatment

Finally, you should consider investing in a shock treatment for your pool before closing it. Shock treatments help to break down any contaminants in the water, such as bacteria or algae, that can form when the pool is not in use. A shock treatment eliminates these contaminants and ensures that the pool is safe and ready for swimming when it is opened for the summer.

People Also Ask

How often should I use a pool closing kit?

A pool closing kit should be used at the end of the season before closing up your pool for winter. This helps to safeguard the pool from contaminants and keeps the pool in good condition until it is opened again in the spring.

What is the difference between regular pool chemicals and those included in a pool closing kit?

The pool chemicals included in a pool closing kit are designed to help close your pool and keep it in top condition over the winter. Many of these chemicals, such as shock treatments and algaecides, are not required to keep your pool in good condition on a regular basis.

Do I need to purchase a pool closing kit if I already have pool chemicals?

If you already have regular pool chemicals, you may not need to purchase a pool closing kit. However, it is still a good idea to have the necessary components for closing your pool, such as shock treatments and pH increasers/decreasers, as these are not typically included in regular pool chemical kits.

Can I use a pool closing kit on an above-ground pool?

Yes, pool closing kits can be used for both above-ground and in-ground pools. Be sure to follow the instructions carefully and use the correct amounts of each chemical.

What steps should I take after using a pool closing kit?

Once you have used a pool closing kit, you should cover the pool with an appropriate cover and add additional layers of protection such as plastic sheeting to help insulate the pool and keep it clean throughout the winter. Additionally, it is important to monitor the water levels throughout the winter and add chemicals as needed.

Final Words

Pool closing kits are an essential tool for any serious pool owner. These kits provide the exact chemicals needed to close your pool safely and with minimal effort and expense. Be sure to purchase a pool closing kit that contains all the necessary components, such as chlorine, algaecide, pH increasers/decreasers, and shock treatments, and follow the instructions carefully. With the right kit and some simple steps, you can keep your pool in good condition until you enjoy it again in the spring.