Best Pool Algaecide

Pool Algaecide Guide

Cleaning a neglected pool can be a daunting task, especially when faced with the green color of built-up algae. Still, a quality algaecide can make light work of what seems to be a job that is going to take some doing. Because the best products are fast working, it shouldn’t be long before the pool is clean and hygienic enough for you to use it again.

This is only going to be the case when you get the right product. To make sure you get this purchase right, we have created the following buyer’s guide.

What To Look For In Pool Algaecide

The Right Color Algae

Different products are to be used with different types of algae. Choosing the wrong one won’t clean your pool in the way you wish because the chemical balance and type is not right.

This is why it is important to match the color and type of algae to the pool algaecide before you make a purchase. 

Bacteria Removing

Sometimes, you need a pool algaecide that can also treat certain bacteria. If you notice pink or red algae, then this is a sign that you need a different type of product to treat the bacteria.


Not every product is going to offer this and it is fone to use a foaming formula if necessary. Still, the benefit of finding a non-foaming pool algaecide is that it allows you to get into the pool sooner. Sometimes a foaming product can cause the sides of the pool to stain which is less likely to happen with non-foaming products.

Lasting Protection

There is little point in purchasing a pool algaecide that doesn’t last as it won’t be long before it returns. Most quality products tend to give you 90 days of protection. This might be more challenging to find when it comes to the likes of black algae which are harder to remove.


Most products proudly display their ability to clear the stained water but to make sure, look for clarifying pool algaecides. These will leave the water in a hygienic and clear state.

What Are The Different Types of Algae?

Identifying the different types of algae is essential to your success in clearing it from your pool. Since there are pool algaecides that are all suited to different tasks, you should know the difference.

Green Algae

The most easily recognized and common, green algae are also known as Chlorophyta. The first signs of green algae usually appear around the steps and corners and can start to form even when you are usually on top of the chemicals.

They grow rapidly so it is always a good idea to act as soon as you notice it forming. An algaecide is useful if you spot it before the problem starts to get out of hand. 

Black Algae

This is the type of algae that you don’t want to see. This is because it is difficult to remove. It leaves an unpleasant stain and has a higher tolerance to chlorine than other types of algae. 

Not all is lost as it’s not impossible to remove, you might find yourself working a little harder to do so though.

Pink Algae

With a slime-like texture, pink algae prefer dark spots and don’t like fast running water so much so make sure you have the pumps working throughout the day.

Yellow Algae

Commonly seen in shaded areas, it can flourish even without much sunlight. It can be difficult to remove and like black algae, it has some resistance to chlorine which means it will take a bit longer to remove than green algae.

What Is Pool Algae?

The chances are you know it from what is usually a green stain and appearance of stagnant water but what exactly is pool algae? Algae is a living organism and although it is not recognized as a plant it grows in a similar way using photosynthesis.

They tend to multiply around pools that are left untreated and grow in both dark places and areas with sun exposure. When they find something to attach to they multiply pretty fast which is why it is important to stay on top of the pool chemicals throughout the year.

Is Algae Harmful?

Although algae are not harmful, it attracts and attaches to harmful bacteria. This is why it is recommended that you maintain your pool with the right pH and chemical levels. 

They love to hang around where decaying debris or waste is present and even the likes of blood are the types of matter that they thrive around.

So, this is why it should not comes as a surprise that salmonella and E.coli and the likes are often present when there are algae around.

How To Prevent Algae

There are several things you can do to ensure you don’t encounter this problem again. Most of them are to do with the ongoing maintenance of a pool.

The first thing to do is to ensure that your pumps are operational. Use them to stop algae from settling as they thrive where the water is slow or still. Another good habit is to run the pumps after cleaning to get rid of any loosened debris. 

Another way to prevent algae is to stay on top of the pool chemistry. When you know maintain optimal pH and chlorine balance you can prevent algae from forming. Use a vacuum and brush the sides to keep it as clean as possible but above all, maintain your pool throughout the year.

This can be difficult if it is next to a holiday home but if not, regular upkeep will ensure algae does not come back.

Can You Use Too Much Algaecide?

The short answer is yes. Because they are made up of chemicals, you can still go over the top. This could cause it to stain the sides and even skin irritation when you get in.

Stick to the guidelines from the manufacturer and make sure you use the right amount for your pool size.

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