How Much Bleach To Put In Pool? (2021 Guideline)

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One important aspect of pool maintenance is understanding the proportion of chemicals to apply. In the quest to have a cleaner pool, you could also be causing more significant damage if you fail to bleach your pool in the right proportion.

Here in this article, we will be presenting all you need to know concerning pool bleaching and how much you need to get rid of any contaminant.

All You Need to Know About Pool Bleaching

As the name implies, bleach has been a product everyone uses to remove tough stains in clothes and other surfaces at home. The same is applicable when used in pools. This household bleach product is nothing different from the one used in pools.

What creates confusion among pool owners is whether pool chlorines are the same as bleach. Well, they are the same because they both have chlorine in them and perform the same function to your pool. The only difference between both lies in their chlorine concentration strength.

Bleach is solid-state chlorine with 5-6% chlorine in it which is why a high proportion of it needs to achieve the same result a small quantity of chlorine can achieve.

In addition, bleach is mainly made of water and a small amount of salt, which helps to keep chlorine gas in a liquid form.

One good side of cleaning pool with bleach is the convenience it offers. Just pour straight to the skimmer. Also, it is inexpensive. But avoid buying the scented bleach because it could add more contaminants to your pool.

How Much Bleach Do I Need for My Pool?

Different factors play a role here when determining the number of bleaches to add to a pool. There is no specific amount of bleach. One major factor is the volume of water, and the other is the present chlorine level.

Before you plan to add bleach to pool water, you should first perform a test to determine the chlorine level. Bleaching aims to maintain a 1-3 ppm. Anything outside this value becomes abnormal and would cause irritations in your eyes and skin.

There is a bleach of choice by many. It is called Clorox. Clorox has been a choice by many because it has a 6% sodium hypochlorite solution with a 5.7% chlorine concentration. It is easy to use and inexpensive. It is liquid with no insoluble particles, making it the best in treating swimming pools.

When it comes to understanding the quantity of bleach added to a pool in relation to the volume of water, you would need to do some calculations to figure that out. To get an estimated volume of water in your pool, simply multiply the depth by the height and the length.

When you know the estimated volume, move ahead to get the total number of gallons of water in the pool. If you have an oval pool, multiple your estimated volume by 6.7. For rectangular pools, multiple by 7.5, and round pools, multiple by 5.9. This will enable you to know the total amount of gallons of water you have in the pool to understand the right amount of bleach to apply.

How Much Bleach Per Gallon Pool?

For every gallon of water, you need to add a quarter teaspoon or 26 drops of bleach to keep your pool from contaminants. So, imagine having about 1000 gallons of such; that means you will have to be thinking of 3oz of bleach.

However, if the pool is cloudy, it will require more bleach to bring it back to give it a clear appearance. Such could need 1/8 teaspoon.

Can I Use Bleach to Shock My Pool?

Yes, bleach can be used to shock a pool, provided it is used in the right proportion. You should know that chlorine and bleach come in different concentrations, and as such, if you need to shock your pool, you would have to use twice as much as you could have used with chlorine.

How to Shock a Pool Using Bleach?

To shock your pool using bleach, you would first run a quick test on the water pH. The pH should be between 7.2-7.8. However, if it’s too high, you can add sodium bisulfate to balance it.

If everything from the pH level looks okay, check the cyanuric acid level. It should be between 20-50 ppm.

Once done, calculate the volume of water per gallon and use your calculations to determine the quantity of bleach to add.

Add the bleach in the right proportion.


Bleach in pool water is as important as having chlorine. They keep your pool crystal clear and prevent any fungi and bacteria growth in the pool. Based on the chlorine concentration level in bleaches, you would need more of the bleach to give you the desired effect.

Remember to add the bleach late in the afternoon to ensure it doesn’t degrade by sun rays. And always read the manual of any bleaching product you purchase to know its application process.