Is Chlorine the Same as Bleach?

We hear it when we stop by to service a customer’s pool; we get calls and receive emails all asking the same question: “Is bleach the same as chlorine?” It’s a fair question, as every pool owner tries to maintain their pool’s cleanliness throughout the season. And while some similarities depend on the bleach and chlorine in question, there’s enough difference that it’s worth addressing. So if you’ve been wondering, “Is pool chlorine the same as bleach?” and vice versa, we’ve got your answer here along with some tips on keeping your pool fresh all season long.

What is Pool Chlorine?

Pool chlorine covers a range of different products you might see at your local pool supply shop or toted around by one of our friendly technicians. Two of the more common products are liquid pool chlorine and chlorine tablets. If you’re asking, “Is liquid chlorine the same as bleach?” you’re certainly right that they’re both liquids with disinfecting properties. They even share the same active ingredient—sodium hypochlorite.

Chlorine tablets, on the other hand, are slightly different from the household bleach you’re used to putting in your shopping cart. These tablets are calcium hypochlorite and pack in way more chlorine than bleach and even more than liquid pool chlorine. However, both types of pool chlorine are specially formulated for use in pools, meaning they contain stabilizers meant to complement your pool’s health, not harm it. So why the two types? They serve two different purposes in your pool maintenance arsenal.

• Liquid Pool Chlorine: Typically 10-12.5% sodium hypochlorite used for routine pool disinfecting purposes.
• Chlorine Tablets: Up to 75% chlorine used to “shock” the pool and provide deep disinfection periodically.

What is Household Bleach?

The answer to the question, “Is liquid chlorine the same as bleach?” is a resounding ‘yes, but…’ and we’ll get to why the big ‘but’ there. Most bleach products available in stores have the same active ingredient as liquid pool chlorine, sodium hypochlorite. And like liquid pool chlorine, the product works as a disinfectant, breaking down cell walls around pathogens, making them unable to survive. Neither household bleach nor liquid pool chlorine works instantly; both take time for the reactive chlorine to break down bacterial cell walls they come into contact with.

Chlorine vs. Bleach: What’s the Difference?

Is pool chlorine the same as bleach? As we said, the answer is yes, but with some key differences. The main difference is in the concentration of sodium hypochlorite. In liquid pool chlorine, the concentration is much higher, at around 10-12.5%, whereas in household bleach the concentration can be as low as 5%.

That difference matters—especially at the pool-sized scale we’re concerned with here. The lower concentration of sodium hypochlorite in household bleach means pool owners will need to use more bleach and wait longer to achieve the same results as liquid pool chlorine. There’s also a risk in purchasing bleach that has additives or fragrances that can damage your pool and disrupt your enjoyment of it.

Can You Use Bleach in a Pool?

In a pinch, yes, you can use bleach in a pool, depending on the purpose for using the bleach in the first place. If you need to “shock” your pool to disinfect it after a long period of non-use or lapsed maintenance, bleach simply won’t cut it. So is chlorine the same as bleach? Not when it comes to shocking your pool.

But if you need to clean your pool and don’t have time to stop by the pool supply store or call your local pool cleaning company, you can use household bleach. There are some precautions, though. Ensure the purity of the bleach you’re using. Additives, dyes, and fragrances can damage your pool. Also check that it’s still fresh; the chlorine dissipates over time, so household bleach bought last year, won’t be as strong as the label says. And be sure to use the right amount, starting with a calculation of your pool’s current chemical composition.

How Chlorine Affects Pool Water Balance

Another way of answering the question “Is bleach the same as pool chlorine?” considers the effect on your pool water’s balance. Chlorine can actually raise the pH level of your pool, increasing its alkalinity. Understanding that fact makes it all the more important to recognize the impact that household bleach’s lower concentration of chlorine will have on your pool.

Additionally, chlorine tablets meant for shocking a pool contain calcium, which affects the hardness of the water and the alkalinity. Bleach won’t have the same effect, which, in some instances, may be a good thing. If your water is already the right level of hardness, you’d want to opt for liquid pool chlorine or bleach to avoid raising that level.

Common Pool Chlorine Mistakes

When it comes to common mistakes, the answer to “Is pool chlorine the same as bleach?” is also yes. The biggest difference in possible issues when using bleach vs. pool chlorine is accidentally using a household bleach that contains harmful additives and fragrances. But beyond that, here are some common pool chlorine mistakes:

• Adding too much or too little chlorine: Both problems are often the result of a failure to test the water before adding the chlorine. This can result in pool water that is unsafe for swimming.
• Using the wrong type of chlorine: Using liquid chlorine when chlorine tablets are needed, and vice versa, can result in a pool that still contains pathogens or water that will irritate swimmers.
• Improper precautions: Bleach and chlorine can be toxic in large quantities, so it’s essential that all proper precautions are taken when using these products. That includes gloves, clothing, and in some cases, a mask to prevent inhalation of harmful fumes.

When to Call a Pool Professional

Armed with the answer to the question, “Is liquid chlorine the same as bleach?” you may feel confident enough to choose and use the best products for the job. But if you’re still unsure about how to best clean, disinfect, and maintain your pool, turn to the pros who know the ins and outs of liquid chlorine, bleach, and chlorine tablets. Ensure your pool stays the site of ultimate relaxation by trusting its tricky maintenance to the experts at White’s Pools. Schedule your pool cleaning or request your quote today!