Do Pool Chemicals Expire?

Jul 3, 2023 | Pool

Pool chemicals are an essential part of maintaining your oasis. During your time as a pool owner, you may have asked: Do pool chemicals expire? This guide will review everything you need to know about the shelf life of these chemicals and how to store them properly. Why Do Pools Need Chemicals? You may have […]

Pool chemicals are an essential part of maintaining your oasis. During your time as a pool owner, you may have asked: Do pool chemicals expire? This guide will review everything you need to know about the shelf life of these chemicals and how to store them properly.

Why Do Pools Need Chemicals?

You may have wondered at some point why pools even need chemicals to be safe. There are several reasons adding chemicals to pool water is a common practice. The first is to allow people to swim in the same water without worrying about contamination from bodily fluids or mucous membranes.

There are many living organisms that could make a home in your pool if you don’t use chemicals. The most common threat is algae, which may pose a health threat if you come in close contact. It’s easier to prevent algae growth than to deal with a bloom.

Factors Impacting Pool Chemical Shelf Life

When do pool chemicals expire? The answer depends on what chemicals you’re using. Things that can impact shelf life include:

  • How they’re packaged and stored
  • Exposure to heat, humidity, moisture or sunlight
  • The chemical composition of each product
  • How stable the chemicals in question are

If you’re storing pool chemicals, you should pay close attention to the labels and make a note of how to maximize their shelf life through safe storage practices.

Types of Pool Chemicals

There are several types of chemicals you may use to keep your pool in great shape. These include chlorine, pH adjusters and algaecides.

Does Chlorine Expire?

Chlorine has an impressive shelf life, but it does expire. Depending on how you store it, you can expect it to stay usable for up to five years. If kept in less favourable conditions, it could go bad in as few as three years.

Do pH Adjusters Expire?

You may occasionally need to increase your pool’s alkalinity, which is where sodium bicarbonate or soda ash comes into play. The shelf life for these products is typically around six months, but you can extend it by keeping them in a cool, dry location.

Do Algaecides and Other Pool Chemicals Expire?

Algaecides are important chemicals because they can address sudden algae overgrowth. Manufacturers state that the chemicals last up to five years before expiring. However, some professionals don’t recommend storing more than you need for a single year in case they go bad sooner.

Generally, the best policy is always to check a product’s expiration date before storing it. Some products may last longer or need to be replaced quicker depending on how they were produced. Different chemical types may have significantly different shelf lives as well.

How to Store Pool Chemicals

Where you store pool chemicals is important — proper storage is safer and can extend shelf life. The best location for pool chemicals is somewhere out of the sun, dry and cool. Leaving chemicals in humid storage sheds throughout the summer will likely degrade them.

Following the manufacturer’s directions is crucial, as this will guide you toward best practices for each unique product. 

How to Recognize and Dispose of Expired Pool Chemicals

The clearest sign that your chemicals are expired is that they stop working effectively. If you’ve attempted to use them and didn’t get the desired result, it might be time to purchase new ones. Never pour old chemicals down your drain or outside when disposing of them. Instead, take them to a waste management facility. 

Trust the Professionals with Your Pool Cleaning Needs

Professional pool cleaning and maintenance can ensure your oasis stays clean and safe throughout the summer. If you have questions about chemicals or need assistance keeping your pool in top shape, Benson Pools can help. Contact us today to learn more.

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