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Best Pool Algaecides in 2022 – Reviewed

Even when you stay on top of the pool maintenance, the pool itself might let you down. If the filtration system is failing you, or you just haven’t had time to clean the pool properly, quality pool algaecide can make it easy to get rid of some of the unsightly, and dangerous build-ups in the pool.

This is only if you buy a product from a reputable brand as not all of them are as good as they claim to be. When this is the case, the pool won’t be as hygienic as you need it to be which can make the whole family ill. To make sure you end up with a product worth using, we have created the following list of the best pool algaecides. There is something for all pool types and budgets.

Quick Summary of Best Pool Algaecides

 Editor’s Choice 
Pool RX 101001 6 Month Algaecide Blue Treats 7.5k-20k gallons, Single, Unit  (review)
 Best For Controlling Algae 
hth Pool Algaecide Super Algae Guard 60 (67064)  (review)
 Best With Pool Shock 
Clorox Pool&Spa 33506CLX Pool Shock XtraBlue (6 1-lb Bags)  (review)
 Best Value 
KLEEN POOL 6 Month Pool Algaecide  (review)
 Best Multi-pack 
GLB 71104A-04 Algimycin 2000 Algaecide for Swimming Pools, 1-Quart, 4-Pack  (review)
 Best For Long Supply 
Pool RX 101003 Swimming Pool Algaecide, 4 Pack, Blue  (review)
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Editor’s Choice: Pool RX 101001 6 Month Algaecide Blue Treats 7.5k-20k gallons, Single, Unit

Although it is one of the more expensive products, it takes a lot of the strain away from maintaining a pool as it can be left for six months to improve clarity and keep algae at bay. It isn’t picky either, eliminating all types of algae so the water is as safe to use as it has ever been. It also means the pool won’t require as many chemicals to stay hygienic and can be used in saltwater pools as well.

It should be placed in the skimmer or pump basket for the best results and means there doesn’t need to be as much chlorine in the pool whilst it is there. The initial outlay might be higher but at the end of the six months, most people save twice as much money so it is easy to see why this is one of the most popular products when it comes to pool algaecides.


  • Last for up to six months
  • Simplifies pool case
  • Kills all types of algae
  • Results in less chlorine


Best For Controlling Algae: hth Pool Algaecide Super Algae Guard 60 (67064)

A 4 in 1 formula that has the backing of thousands of happy pools and is among the most effective going. It kills the likes of green, yellow, and black algae to bring back the reassuring clarity that makes a pool so inviting. The strength is 60% which is standard for a pool algaecide and it is a non-foaming formula.

Not only does it help to maintain the right balance of chemicals but it kills algae and helps to prevent it from coming back. Made in the USA, it will target those tough algae blooms that seem to be out of control. It won’t take long for the pool to be safe to use again which is standard when there have been algae present.


  • 4 in 1 formula
  • Non-foaming
  • Helps to prevent more algae from forming
  • Made in the USA

  • Smells stronger than some of the competition

Best With Pool Shock: Clorox Pool&Spa 33506CLX Pool Shock XtraBlue (6 1-lb Bags)

The combination of pool shock and algae killing formula makes this an excellent product for when the water is particularly bad and needs a boost to bring the clarity back. The best part is that it both kills and prevents different types of algae from forming whilst improving the performance of the filter. By killing bacteria and algae it takes some of the strain off the working parts.

Once used, the pool can be ready after just 15 minutes and the water will be safer than before, especially since it helps to control chlorine levels and reduce irritation on the eyes and skin. Fast to dissolve and easy to use, it is best administered at night so the sun can’t cause degradation.


  • Kills and prevents algae from forming
  • The pool is ready to use in 15 minutes
  • Fast to dissolve
  • Takes the strain off the filter

  • Goes fast

Best Value: KLEEN POOL 6 Month Pool Algaecide

Suitable for saltwater pools as well as freshwater, this is a six months supply of an effective pool algaecide. This long-life formula stops algae from returning for months on end and itis ideal when you want to cleanse the pool water at the start of the season.

The only time it will be necessary to add more is when the pool starts to look green but when following the instructions, this shouldn’t happen for 4-6 months depending on the climate and surroundings. The one-gallon supply might be on the pricey side, but it will be the only product needed to keep algae away for half a year.


  • Lasts for up to six months
  • Easy to use
  • One gallon supply

  • Can be on the pricey side for some

Best Multi-pack: GLB 71104A-04 Algimycin 2000 Algaecide for Swimming Pools, 1-Quart, 4-Pack

For an ample supply of pool algaecide, look no further than this product from GLB. It includes a 4 pack of the 1-quart containers and works against all types of algae to keep the water clarity looking its best. EPA approved, it is a non-foaming formula that won’t stain any part of the pool before or after use.

It is safe to use on vinyl lined pools and is one of the most popular in the niche for its reliability and ease of use. We like that it can be used weekly and the active ingredients are at an optimal dosage to control the likes of green, yellow, and black algae.


  • Good value
  • EPA approved
  • Fine for vinyl lined pools
  • Nonfoaming

  • Not everyone wants so much algaecide in one go

Best For Long Supply: Pool RX 101003 Swimming Pool Algaecide, 4 Pack, Blue

Although the initial outlay might seem like a lot, it helps to save money and time on pool maintenance, giving the user a near 2 -year supply. This means there will be no need to worry about algae for a long time, and since they are placed in the pool skimmer or pump basket, there is virtually no maintenance when using this pool algaecide.

It targets all types of algae and even helps to clean the water in other ways, meaning less chlorine to be added. Each one is effective for around six months when the pool is. properly maintained and although it is advised that the user cleans or backwashes their filter first, using them is easy.


  • 2 year supply
  • Easy to use
  • Less need for chemicals
  • targets all types of algae

  • On the pricey side

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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