When Should I Add Algaecide To My Pool?

Algae growth in pools is a massive headache to deal with. Many pool owners encounter this problem at least once in their life. One way to make the problem go away quickly is by using a chemical called algaecide.

When should I add algaecide to my pool? Some pool owners only add algaecide when there is an excessive amount of algae in the water. But, it is a good practice to use it as prevention rather than a cure. Adding algaecide at least once a week is good enough.

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After reading this article, you will understand what algaecide is and how it works. In addition to this, you will know when to use it and how to add algaecide to your pool.

Algaecide Explained

Algaecide is a chemical sanitizer that kills algae and also prevents algae from growing. This chemical works alongside chlorine to clean your pool and make sure it is safe to swim in. Algaecide comes into contact with algae cells and kills the plant by destroying its cells.

This chemical is quite versatile. Algaecide is mostly used for killing algae. Aside from this, it is also very effective for removing mold, slime, fish pathogens, and other harmful microorganisms.

When To Use Algaecide

Every pool owner is undoubtedly different. Some are very meticulous about maintaining their swimming pool and keeping everything in check. Others are more relaxed and deal with things as they come. You can use algaecide as a part of your regular pool maintenance. If not, you can also add algaecide to your pool as a solution to algae contamination.

Here are ways you can use algaecide and how often you should use it:


Pool owners may decide to use algaecide regularly as a form of prevention. To use it this way, you would have to add it to your pool at least once a week. Depending on your preference, you could even add algaecide more frequently. Using algaecide more often will give you peace of mind, so you do not worry about your pool’s uncleanliness.

After Shock Treatments

Usually, you would also add in algaecide after doing a shock treatment on your pool. You should routinely shock your pool to keep it clean. Shock treatments are done every one to two weeks and are accompanied by algaecide. You can use algaecide more frequently as long as you do not forget to add some after shocking your pool.

Removing Algae Blooms

The primary purpose of algaecide is to kill algae, so others only add it in once the problem has escalated. There is nothing wrong with this, but it is not as solid of a plan as prevention. You may have to use a lot more algaecide in one go depending on how fast the growth is.


To conclude, algaecide is imperative to proper pool maintenance. It is useful for not only killing algae but preventing algae from growing in the first place. For the best results, you should add this to your pool at least once a week.

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