8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (2023)

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Having a clean pool doesn’t happen by chance. Quite the opposite: in order to maintain a pool, you need to follow a range of key ground rules. Perhaps one of the most commonly met disturbances encountered by pool owners is the buildup of algae. Did you know that the primary reason why algae grow in your spa and pool is that you haven’t sanitized it accordingly? If you don’t do anything in this respect as soon as you notice this problem, it will only become more severe by the day. Before you know it, your pool will turn green. And this is, without a doubt, an unsightly view.

This is why it might be a good idea to start looking for the best algaecide for pools. These are used primarily for eliminating algae, helping you keep your pool in top condition. Our algaecide for pools reviews should guide you in the shopping process!

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How to Clean a Green Pool

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (1)Having a green pool is a nightmare. This is something most pool owners will agree on. But what makes a pool green? Why does this happen?

For the most part, algae are to blame. Algae grow due to the existence of a chemical imbalance. When you treat your pool accordingly with chlorine, this should prevent the growth of algae. This is primarily why you should aim at maintaining balanced chemistry.

Essentially, if your pool is green, this means one thing: there is insufficient or no chlorine whatsoever in your pool. If you plan to shock the pool, this means that you should be adding a lot of chlorine. Doing a test beforehand is important.

You should also test for pH: if the pH is too high, the shock will make your pool cloudy. And you don’t want that either.

  • Are Algaecides Efficient for Cleaning a Green Pool?

This is a good question. And the answer is positive. Depending on the type of product you’ve purchased, some might be more efficient than others. But the truth is that some products are highly efficient.

Algaecides can transform green pools in clean pools right away. It might be a good idea to add chlorine as well. These two combined should help you solve your problem for good. In case your pool is still green after using algaecide, you should add chlorine – that if you haven’t done it before.

Other important steps you should follow are properly brushing and filtering your pool. After shocking your pool, you should notice a significant difference. But the water will most likely still be cloudy.

In order to address this issue, you should focus on brushing. This is usually because, in some areas, the algae might be more stubborn. Now, if your pool is still green after following these steps, then you might be dealing with an imbalance. This is why you should have a test kit.

Types of Algaecide for Pools

We’ve already established that algaecides can assist you in killing and preventing pool algae. They are used basically to eliminate small and solo blooms, thus controlling the development and regrowth of algae. But different algaecides work differently, as you might expect.

  • Quat pool algaecides

Also referred to as Quaternary Ammonium compounds, these usually include detergents. This is why if you add more than the amount recommended by the manufacturer, you will most likely notice foaming.

Basically, this type of algaecides encompasses microbial disinfectants. They attach to the negatively charged component of the algae. In this way, the outer cover of the algae is destroyed. This will enable the chlorine to penetrate and kill it. Usually, the concentration level ranges from 10 to 50.

  • Polymer pool algaecides

Polymer pool algaecides represent poly-quat elements, and they feature long carbon chains. Similar to the first type of algaecides, they also have a positive charge. This is why they get attached to the negatively charged algae. This is how they manage to smoothen the cells.

In terms of effectiveness, they are considered to be more effective than quat pool algaecides. Their effects are also long-lasting. But usually, they are more expensive, by comparison. As for the concentration of the formula, it ranges from 30 to 60 percent.

  • Metallic pool algaecides

The third category is represented by metallic pool algaecides, and they incorporate copper ions in their composition. You might be surprised to learn that copper ions have been used for centuries in treating water.

They work similarly to the first two categories. Usually, these algaecides are highly efficient against green and black algae, and their concentration level is 7 percent.

Best Algaecide for Pools Comparison Chart

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (2)

In The Swim Swimming Pool Algaecide

  • Price: $
  • Content: 1/2 Gallon
  • Dosage: 6-11 oz. per 10,000 gallons
  • Benefits: Kills and controls all types of algae, including pink algae
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8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (3)

Clorox Pool&Spa XtraBlue Algaecide

  • Price: $$$
  • Content: 40 oz
  • Dosage: 1 bottle enough for 12000 gallon
  • Benefits: Results in 24 hours
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8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (4)

hth Pool Algaecide Super Algae Guard 60

  • Price: $
  • Content: 32 oz
  • Dosage: 1.5 ounces
  • Benefits: 4-In-1 formula kills and controls green, Black, and yellow algae growth
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8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (5)

Kem-Tek 60-Percent Concentrated Algaecide

  • Price: $$
  • Content: 1 Quart
  • Dosage: 16oz per 10000 gallon
  • Benefits: Long Lasting Non- foaming
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8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (6)

SeaKlear 90-Day Algae Prevention & Remover

  • Price: $$
  • Content: 1 Quart
  • Dosage: 32 fluid ounce per 10000-gallon
  • Benefits: 90-days no algae guarantee
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8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (7)

Pool Mate Algaecide 50 Swimming Pool Algaecide

  • Price: $$$
  • Content: 1 Quart
  • Dosage: 2 or 3 oz per 10,000 gallons
  • Benefits: Effective against all algae types
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8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (8)

PoolRx 4-Pack Blue Units Swimming Pool Algaecide

  • Price: $$$$$
  • Content: 4 pack
  • Dosage: Each unit for 7,500 to 20,000-gallon
  • Benefits: Effective for up to 6 months
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Best Algaecide for Pools – (Newest Models)

1. In The Swim Super Pool Algaecide

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (9)First, we would like to introduce you to one of the best algaecide. This is copper-based and does an excellent job at killing and deterring the regrowth of algae – more specifically green and yellow algae. The formula is highly concentrated, which ensures that your pool will be properly sanitized.

Another advantage worth mentioning would be that the formula has non-foaming properties. It encompasses 7.1 percent chelated copper, this is how it manages to handle most algae and remove them from your pool. However, note that if you’re struggling with black algae, this algaecide isn’t the right alternative, as it doesn’t target this type of algae.

If you want to incorporate this product in your pool maintenance routine, you should know that a bottle will suffice for roughly six months or so. It’s always best to track down the levels of chlorine after using this.

That’s mainly because of this algaecide functions in synergy with chlorine. Initially, the original dosage would be 6-11 oz. per 10,000 gallons of water. As for the maintenance dosage, it is of 2 ounces.


  • Non-foaming formula
  • You can swim in the pool water after using this
  • Time-efficient, fast-acting solution


  • It isn’t efficient at removing black algae

2. Clorox Pool&Spa XtraBlue Algaecide

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (10)This is another fast-acting algaecide that will do an excellent job at eliminating algae from settling in your pool. If you already have this issue, this will most likely help you.

The formula doesn’t create any foam when you add it to the water. As for its efficacy level, it does a good job at killing and deterring algae from settling again in your pool water. You can expect it to do a decent job also in saltwater pools.

Many former users have included this product in their regular maintenance program. If you normally cope with algae, this would be a good idea worth trying.

Another advantage worth noting would be that you don’t have to use this on a daily basis. In order to ensure that it works, you should use it on a weekly basis. This will save you both time and money. Also, if you want to obtain perfect results time after time, it’s a good idea to brush the surface of the pool.


  • The formula is non-staining, meaning that it won’t affect the liners or the walls of your pool.
  • Versatile: you can use it in most types of pools
  • Quick and effective action


  • If you overuse it, it might create foam inside your pool water
  • It works only against green algae

3. hth Pool Algaecide Super Algae Guard 60

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (11)This would be another product that could help you get rid of nasty algae. The formula is actually 4-in-1. That is to say, it targets and kills green, black, and yellow algae. In addition to that, it promises to control the regrowth of algae.

If you’ve been dealing with this issue for a while now, then you might consider using an algaecide such as this one on a regular basis. Concurrently, it is compatible with every pool salt system. Another benefit would be that you can start swimming in the pool as soon as the concentrate has done its job.

Something you shouldn’t overlook if you’re struggling with unbalanced chemical levels in your pool is cleaning your filter. While an algaecide will be very helpful, if the filter isn’t cleaned and maintained accordingly, the problem will emerge again and again, giving you a lot of headaches.

Just as important is to brush the pool especially after using the concentrate. Otherwise, there is a slight chance for algae to appear once again. There may be some isolated scenarios in which you might need to shock your pool before being able to use it.

This is true especially if the algae situation is stubborn.


  • Great value for the money
  • It does the job
  • A convenient solution to a common problem


  • You cannot use this if the water inside the pool doesn’t circulate. So, for the concentrate to work efficiently, the water inside your pool must circulate.
  • According to former customers, it does foam.

4. Kem-Tek 60-Percent Concentrated Algaecide

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (12)This is one of the most popular algaecides on the market. Why is that? For one thing, it is highly concentrated. This means it can deal with the nastiest algae infestations.

Concurrently, you should be pleased to learn that this particular algaecide is highly efficient in fighting against most algae. In addition to that, it is compatible with different types of pools, including above ground pools.

Тo get rid of the algae that are building up in your pool, you should simply follow the instructions outlined on the bottle.

When it comes to the composition of the product, it encompasses 60 percent of active ingredients. This is mainly how it manages to act as quickly as it does. Not only that this will eliminate existing algae, but it also promises to prevent regrowth. Therefore, once you treat your pool once, you should be stress-free.

In addition to that, it doesn’t create any unpleasant foam or anything of the kind. This means you can most likely start using your pool shortly after treating it with this concentrate.


  • Fast action
  • It doesn’t create any foam
  • Long-lasting results
  • It prevents the regrowth of the algae


  • As pointed out by some former customers, in some instances, a second application is needed.

5. SeaKlear 90-Day Algae Prevention & Remover

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (13)Moving on to another metallic algaecide, this is also known for its high-efficiency level. It features 11.8 percent copper sulfate pentahydrate. This aims at killing and preventing the likelihood of algae regrowth.

Furthermore, this is efficient in removing yellow, green and black algae. The solution doesn’t produce any foam. This means it dissolves at a fast pace, without having an impact on your pH levels.

Even if you notice that the algae aren’t completely gone until the next day, you shouldn’t worry too much. In most cases, once you brush the pool, you will most likely not see a trace of algae.

In comparison with other algaecides, this one is EPA registered. It also comes with the guarantee that it will prevent algae regrowth for 90 days.

An inconvenience worth noting would be that in the case of overdosage, it will most likely stain your pool. This is why you should pay extra attention to using the recommended dosages as advised by the manufacturer.


  • Fast dissolving action
  • It doesn’t change the pH level of your pool water
  • Efficient against all types of algae


  • In the case of overdosage, this will stain your pool.

6. Pool Mate Algaecide 50 Swimming Pool Algaecide

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (14)Many former customers were actually skeptical regarding the efficiency of this algaecide. But they were really surprised by the results, as this product does a good job.

Perhaps a small nuisance mentioned by some people was that the smell is relatively unpleasant. But normally, this would come with the territory. That’s because such products contain a mixture of chemicals.

Meanwhile, other people that have struggled with algae each time after it rained said that this product was the only one that solved the issue.

Foam might be an issue – sometimes, it might occur in small quantities. But this is not the norm. There are times when the solution doesn’t create any foam whatsoever.

On a different note, you might know by now that black algae tend to be the most stubborn type. But this one aims at removing even black algae, which is good to know if you’re looking for a solution to this problem.

You will need to use roughly 1/3 bottle as maintenance on a weekly basis if you want to ensure that the algae don’t come back to haunt you.


  • Effective in treating black algae as well
  • Good value for the price
  • Fast and efficient action


  • It might create localized, mild foam in some instances.

7. PoolRx 4-Pack Blue Units Swimming Pool Algaecide

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (15)This is another top pick that has been highly praised by past users. Regardless of the type of algae you’re dealing with, this algaecide can most likely handle it. In fact, former customers pointed out that this product was the only one that actually helped them get rid of a stubborn infestation.

A pack features four individual units. Each unit can be used for pools with a 7,500 to 20,000-gallon capacity. As a rule of thumb, though, prior to treating your pool, you should clean your filter. Only afterward should you place the algaecide unit in the skimmer basket or in the pump basket.

Before you know it, your pool water will turn from green to sparkling clean. Generally speaking, the time needed for the pool water to recover ranges from two to four days.

The formula contains active ingredients, mostly minerals. These will dissolve and create a stable residual. This will remain in your pool for roughly six months or so, preventing the regrowth of algae.

You’ll also get a well-balanced pool. How is that? This has to do with the fact that, due to the minerals, you’ll need to add a smaller amount of chlorine to the water.


  • Long-lasting results – up to six months
  • It helps you get rid of all sorts of algae
  • Easy to use


  • You’ll still need to treat your pool with chlorine as outlined by former customers.

8. EasyCare 0064 PoolTec Algaecide, Clarifier and Chlorine Salt Cell Booster

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (16)If you want to reduce the use of chlorine in your pool, as it doesn’t address the algae issue, this product might be a good alternative. That is mainly because it diminishes chlorine use by up to 65 percent.

This should make the job of maintaining your pool easier. A bottle should be enough for an average 20,000-gallon pool – so, bear this in mind before ordering it. You should include 4 oz. of this algaecide on a weekly basis for 10,000 gallons of water.

This way, you can rest assured that the pool water will be algae-free, clean and clear. Plus, there’s no waiting time after using the solution in your pool: you can swim right after the treatment.

It’s also easy to use, meaning that you don’t have to do anything overly complicated. All you have to do is pour the algaecide in the water and that’s about it. Plus, it works against yellow, green and black algae alike. All in all, it works great.


  • Highly efficient against all types of algae
  • Easy to use
  • You can swim inside the treated water right away


  • It doesn’t eliminate the need for chlorine treatment altogether.

What Are the Main Benefits of Using Algaecide?

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (17)Before you get carried away and purchase the best algaecide, you should get acquainted with the main benefits linked to this product. With that in mind, here’s a list that will most likely convince you to give it a try.

  • Killing Algae

Without a doubt, this is the main benefit worth noting. Algaecides are made to destroy algae. In this way, you can keep and maintain your pool clean and sanitized. Typically, an algaecide comprises of a powdered or a liquid substance, and it is made to chemically eliminate algae. And the best part is that it does that fast.

Although you might use chlorine in order to sanitize your pool, algaecides do the best job at killing algae. Beware that regular pool vacuums will likely do not do the trick. We recommend you still check out our reviews on the top above ground pool vacuum cleaners because you simply have to have one in your arsenal albeit for other purposes.

  • Preventing the Regrowth of Algae

Many pool owners struggle with algae. Even if they do manage to get rid of them, in many instances, the algae will return. This has to do with the fact that an outdoor pool is exposed to elements such as wind and rain. But even when there’s no rain, your pool might still end up infested with nasty algae.

This is why you should focus on maintaining your pool accordingly. And using algaecide might help you in this respect. Not to mention that using such a product requires little time, yet the results are noteworthy.

However, simply using algaecide won’t prevent the regrowth of algae. Many people expect this and end up being disappointed by the product they purchased. You should also ensure that the filter to your pool is clean. In addition, it should work well so that the water circulates accordingly.

  • Enjoy a Clean, Sanitized Pool

When you no longer have to worry about nasty algae, you can finally enjoy your pool. And the best part is that you can swim in clear, sparkling water.

  • Quick Results

Another benefit would be that most algaecides on the market act fast. That is to say, there are some products that will make your pool impeccable in a matter of minutes. Meanwhile, others might need hours to do their job. Either way, with algaecide, you’ll get the results you want fast.

What Are the Main Drawbacks of Using Algaecide?

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (18)Although algaecides can be very efficient in your fight against algae, there are still some drawbacks you should get acquainted with. The thing is that, in some cases, you will most likely need to resort to chlorine to solve the problem.

That’s because, in some situations, chlorine is more efficient in this respect. That is mainly because chlorine oxidizes bacteria and single-celled algae. Basically, this means that chlorine trades electrons.

This is why it is crucial to maintain the right chemistry in your pool. It’s also highly recommended to test your pool water on a regular basis. This is actually the key to maintaining it clean and sanitized.

In addition to that, some algaecides contain copper. In some cases, the copper might end up staining your pool. But this usually depends on the area in which you live. If you live in an area where the water has a high metal content, then using algaecide might result in increasing oxidation.

Many people overlook the importance of investing in the top pool water test kit. But this is essential, especially if you feel that you could use a pool shock.

However, before purchasing such items, you should find a provider that offers a good variety of pool supplies and accessories. High-quality and reliability are aspects you should look for each time you want to make such a purchase.

Features to Look for Algaecide for Pools

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (19)As opposed to purchasing the first algaecides you find on the Internet, you should compare different options first. This is why we’ve assembled the features to look for before making a purchase. Here they are:

  • The color of the algae

Different algae interact differently with specific chemicals and compounds. This is why you should consider the type of algae you’re dealing with before picking a product. Otherwise, you might end up being disappointed that the product didn’t work as you expected.

  • Existence of bacteria

In some cases, you might have traces of bacteria in your pool. You should be able to establish this by carrying out a test. But usually, when the algae are pink or red, this might be an indicator that bacteria are ever-present in your pool.

In this situation, you will need a particular type of algaecide if you want it to work as expected.

  • Quick action

Even though you might not need to use your pool right after treating it, you still don’t want to wait around for days until you can use it. This is why you should pick a product that is highly efficient and will do its job fast. Getting acquainted with the chlorine chemistry will be greatly beneficial to you.

  • Pool friendly

Since there are different types of algaecides on the market, you should be 100 percent sure that you’re purchasing something that’s designated for pools. That would mean that the product is safe to use in a swimming environment.

  • All-season

There are some products that keep your pool clean even during the winter when it’s not in use. There’s nothing worse than opening your pool and realizing that it has become green during the colder season.

  • Stain removing

There are some products that could lead to pool staining. This can be very unpleasant. So, make sure you consider the chemical structure of the water in your area beforehand, as this plays a key part in the process.

Maintenance Tips

8 Best Algaecide for Pools – (Reviews & Buying Guide 2021) (20)What are some important maintenance tips that will keep your pool sanitized and clean? Just as with any other thing, maintenance is an important aspect, although it is highly overlooked.

The truth is that, even if the environment is perfect, if you don’t pay attention to maintaining your pool, sooner or later, you’ll find it overflowing with algae. These are some habits that will make the world of a difference over the course of time:

  • First of all, you should have a clean filter. The filter should function accordingly, as it has a crucial part in circulating the water. The water must circulate in order for the chemicals to be evenly distributed.
  • Every now and then, you should conduct a thorough scrubbing of the pool walls, floors, and steps. Although this is not the most pleasant step, is it necessary.
  • Test the water on a regular basis. Afterward, you should ensure that the chemicals inside it are appropriately balanced.


When it comes to differentiating between different types of algaecides, you have to think of several aspects. For one thing, you should think of the type of algaecide you intend to purchase. It is just as important to determine whether the product will cause staining or not.

You should check for a warning on the package, as most manufacturers indicate if there’s an issue in this respect. Copper-based metallic algaecides are known to stain the most. Also, some products offer protection for an extended timeframe, while others have to be reapplied sooner.

Safety Tips

  • Always follow the instructions provided on the label, especially when it comes to dosage instructions. These can differ depending on the product.
  • You should avoid adding algaecide and pool shock in the water simultaneously. Before adding algaecide, you should wait for the chlorine level to be lower than 5 ppm.
  • Focus on maintaining balanced pool water: you should steer clear of high alkalinity, pH, or calcium hardness levels.
  • Make sure you don’t overdose; always match the dosage to the size of your pool.
  • Clean the pool regularly: the presence of heavy organic metal in the pool (lawn debris and leaves) will impair the effectiveness of the algaecide.
  • Ensure that the circulation and filtration system works appropriately.

Wrap up

As soon as you notice algae in your pool, you should take the necessary steps to prevent them from taking over the water. In order to solve the issue right away, looking for the best algaecide for pools is a good starting point. Since it is difficult to choose one product out of so many available options, our algaecide for pools reviews should be helpful.

However, make sure you always consider your needs prior to making a purchase. Determine what type of algae you’re dealing with, whether your pool water is balanced or not, and if it needs a shock or not. It’s always a good idea to implement good maintenance practices. This is ultimately the key to enjoying crystal clear water.

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