Best Swimming Pool Algaecides of 2025

Bryan Hicks Avatar
Bryan Hicks
Last Updated: Jan 14, 2025

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Swimming pool algaecides are an essential component of any pool maintenance routine. These products are designed to prevent and treat algae growth in your pool, helping to keep the water clear and clean. Algae can quickly take over a pool, turning the water green and making it unsanitary for swimming. Swimming pool algaecides work by disrupting the growth and reproduction of algae cells, preventing them from spreading and taking hold in your pool. There are a variety of algaecide products available, including those that are chlorine-based and those that are non-chlorine-based. It's important to choose the right product for your specific pool and needs, and to follow the instructions carefully for best results.

At a Glance: Our Top Picks

Clorox Pool&Spa 43128CLX 42128CLX Pool Algaecide Cover #TOP 1
Clorox Pool&Spa 43128CLX 42128CLX Pool Algaecide
ftb score rating icon 9.8
Clorox Pool&Spa Green Algae Eliminator2 32 oz Cover #TOP 2
Clorox Pool&Spa Green Algae Eliminator2 32 oz
ftb score rating icon 9.7
HTH 67289 Algae Guard Ultra Cover #TOP 3
HTH 67289 Algae Guard Ultra
ftb score rating icon 9.5

Top 10 Swimming Pool Algaecides

#TOP 1

Clorox Pool&Spa 43128CLX 42128CLX Pool Algaecide

Clorox Pool&Spa 43128CLX 42128CLX Pool Algaecide Cover
Clorox® Pool&Spa™ Swimming Pool Algaecide and Clarifier, Prevents and Treats Pool Algae, Clears Water, 128 Fl Oz (Pack of 1)

Clorox Pool&Spa 43128CLX 42128CLX Pool Algaecide is a non-foaming formula that prevents and treats pool algae, and is suitable for all pool types. It also has a built-in clarifier that helps keep your pool clean and clear. Customers have praised its effectiveness in controlling algae, and its affordability compared to other products or services.

What We Like
Effective algae removal
Clear pool water
Cost-effective solution
Easy to follow instructions
Good for regular maintenance
What We Don't Like
Requires full bottle use
Not as effective as some brands
#TOP 2

Clorox Pool&Spa Green Algae Eliminator2 32 oz

42232CLX
Blue
1-Quart
Clorox Pool&Spa Green Algae Eliminator2 32 oz Cover
Clorox® Pool&Spa™ Swimming Pool Algaecide, Prevents and Treats Pool Algae, Non-Foaming, 1 Quart (Pack of 1)

Clorox Pool&Spa Green Algae Eliminator2 32 oz is a non-foaming liquid formula designed to effectively kill and prevent algae growth in all types of pools. It is suitable for all pools and controls algae, making it a great choice for those looking for a reliable algaecide. Customers have praised its easy-to-use formula and its ability to keep their pools crystal clear.

What We Like
Effective algae elimination
Quick results
Easy application
Maintains clear water
Trusted brand
What We Don't Like
Price of chemicals increased
#TOP 3

HTH 67289 Algae Guard Ultra

HTH
67289
Blue
No Size
HTH 67289 Algae Guard Ultra Cover
HTH 67289 Swimming Pool Care Algae Guard Ultra, Swimming Pool Chemical, Long Lasting Formula, 32 fl oz

HTH Algae Guard is a powerful swimming pool care product designed to provide long-lasting protection against algae. Its non-foaming formula effectively kills and prevents blooms of all algae types, including heavy green, black, and mustard algae. With HTH Algae Guard, you can enjoy a clean and clear pool for up to 3 months. This fast-acting solution can be added directly to your pool water, allowing you to swim right away. Whether you have a vinyl-lined pool or a saltwater system, this non-staining formula is compatible with all pools. For best results, use HTH Algae Guard every 3 months in combination with HTH Shock products.

What We Like
Effectively eliminates stubborn algae
Long-lasting results (up to 90 days)
Reduces chlorine usage significantly
Maintains water clarity and pH
No foam issues reported
What We Don't Like
Some users find it pricey
#TOP 4

Pool RX 101001 6 Month Algaecide

101001
Blue
Single Unit
Pool RX 101001 6 Month Algaecide Cover
Pool RX 101001 6 Month Algaecide Blue Treats 7.5k-20k gallons, Single, Unit

The Pool RX 101001 6 Month Algaecide is a highly effective solution for eliminating all types of algae in swimming pools. This algaecide is designed to simplify pool care and reduce chemical demand, making it an ideal choice for pool owners who want to keep their pools clean and clear. It is effective for up to 6 months and can treat pools ranging from 7.5k-20k gallons. Additionally, it is suitable for use in salt pools.

What We Like
Effective algae removal
Reduces chemical usage
Clearer pool water
Easy installation
Cost-effective solution
What We Don't Like
May require occasional replacement
Initial investment cost
#TOP 5

Pool RX 6 Month Algaecide

101066
Black
Single Unit
Pool RX 6 Month Algaecide Cover
Pool RX 101066 6 Month Algaecide Treats 20k-30k gallons, Black

The Pool RX 101066 6 Month Algaecide is a simple and effective solution for maintaining a clean and clear pool or spa. This algaecide eliminates all types of algae and reduces the need for other chemicals, making pool and spa care easier and more convenient. Simply place the unit in the pump or skimmer basket and enjoy up to 6 months of effective treatment for pools between 20k-30k gallons.

What We Like
Improves water clarity
Reduces algae growth
Less chemical usage
Easy to use
Long-lasting effectiveness
What We Don't Like
Recent packaging issues
Some liquid leakage observed
#TOP 6

In The Swim Super Pool Algaecide

F055001012AE
Multicolor
1 Quart
In The Swim Super Pool Algaecide Cover
In The Swim Super Algaecide for Above Ground or Inground Swimming Pools – Low Odor, Non-Foaming Preventative for Yellow/Mustard Algae in Swimming Pools - 7.1% Chelated Copper – 1 Quart

In The Swim Algaecide is a copper-based formula that helps to keep algae growth at a minimum, making it great for spring openings and routine maintenance of your swimming pool. Its highly concentrated copper-based formula eradicates small, isolated blooms to control and prevent yellow or mustard algae growth. The higher concentration allows for small easy-to-measure dosages, which means fast-acting performance. Unlike other copper-based algaecides, the chelated copper in this formula will protect your swimming pool from staining. In The Swim Algaecide is non-foaming, has low odor, and is safe to swim in immediately following use, as it does not contain harmful chemicals.

What We Like
Effectively controls algae
Easy maintenance routine
Cost-effective compared to local stores
Visible results in 12 hours
Compatible with other pool products
What We Don't Like
Potential for copper staining
Requires some knowledge for proper dosing
#TOP 7

Clorox Pool&Spa XtraBlue Algaecide

44340CLX
40-Ounce
Clorox Pool&Spa XtraBlue Algaecide Cover
Clorox® Pool&Spa™ XtraBlue Swimming Pool Algaecide, All-in-One Algae Killer, Non-Foaming, 40 Ounce (Pack of 1)

Clorox XtraBlue Algaecide is your go-to solution for keeping your swimming pool free from algae. This powerful algaecide acts quickly, eliminating various types of algae within just 24 hours. You can enjoy a clean pool without worrying about green, mustard, or black algae. Its non-foaming formula not only prevents algae growth but also protects your pool from stains, ensuring a clear swimming environment. Plus, it’s compatible with saltwater pools, treating up to 25,000 gallons, so you can spend more time enjoying your pool and less time maintaining it.

What We Like
Simple to use
Effective algae removal
Cost-saving
No odor
Non-foaming formula
What We Don't Like
May require more product than expected
Not quick for all water issues
#TOP 8

In The Swim Algaecide 60 Plus

Y1300
multi-colored
1 Quart
In The Swim Algaecide 60 Plus Cover
In The Swim Algaecide 60 Plus for Swimming Pools - Non-Metallic, Low Odor, Non-Foaming Algae Bloom Preventative - Chlorine Sanitizer Compatible - 1 Quart

Keep your swimming pool clean and free of algae with In The Swim Algaecide 60 Plus. This non-metallic, non-foaming, low-odor polymer-based algaecide is recommended for use with well water and is not affected by pH. It kills all types of algae, including pink algae, making it a versatile solution for pool owners.

What We Like
Effective against algae
Cost-effective compared to local stores
Long-lasting results
Easy to use
Quick results in pool clarity
What We Don't Like
Poor packaging during delivery
#TOP 9

PoolRX+ Pool Unit 7.5k-20k Gallons

331001
Blue
7.5k-20k
PoolRX+ Pool Unit 7.5k-20k Gallons Cover
PoolRX+ pool unit 7.5k-20k gallons

PoolRX+ Pool Unit 7.5k-20k Gallons is a swimming pool algaecide that eliminates all types of pool algae and reduces chemical demand. It is effective for up to 6 months and is NSF/ANSI 50 certified. Customers have praised its ability to quickly and effectively clear up their pools, with some even claiming that it has eliminated their yearly algae issues.

What We Like
Effective algae prevention
Reduced chemical usage
Easy installation
Long-lasting performance
Compatible with various pool systems
What We Don't Like
Increased copper levels
#TOP 10

AquaDoc Copper Pool Algaecide 32oz

AD-PA
AquaDoc Copper Pool Algaecide 32oz Cover
Copper Pool Algaecide for Swimming Pool - 90 Day Algaecide for Inground Pool to Prevent and Remove Pool Algae - Super Algaecide for Pool Opening - AquaDoc 32oz

The AquaDoc Algaecide is designed to keep your pool algae-free for up to 90 days. It effectively targets and eliminates various types of algae, including mustard, green, blue, and black, making pool maintenance easier for you. This non-foaming and non-staining formula not only removes existing algae but also prevents its regrowth, ensuring long-lasting clarity. Additionally, it enhances the effectiveness of your pool sanitizer, reducing the overall chemicals needed. Enjoy a cleaner, clearer pool with minimal effort!

What We Like
Effective against algae
Long-lasting results
Improved water clarity
Convenient application
What We Don't Like
Variable effectiveness
May require additional measures
Buying Guide Image

The Best Swimming Pool Algaecides for Every Budget

Introduction

Swimming pools are a great way to beat the summer heat, but they require regular maintenance and cleaning to stay healthy and safe for swimming. One of the most important steps to keep your pool clean and safe is to use algaecides. Algaecides are products that help control algae growth in your pool and keep it free of contaminants. But with so many products on the market, it can be difficult to know which one is best for your pool. In this article, we will discuss the different types of algaecides and how to choose the right one for your pool.

Types of Algaecides

There are two main types of algaecides on the market: quaternary ammonium compounds (QACs) and polyquats. QACs are the most common type of algaecide and are usually used for general algae control. These products are effective against a broad range of algae, including green, black, and mustard algae. Polyquats, on the other hand, are more specialized and are used to control specific types of algae, such as black algae.

Factors To Consider When Choosing Algaecides

When choosing a swimming pool algaecide, there are a few factors to consider. First, consider the type of algae you need to control. QACs are effective against a broad range of algae, while polyquats are more specialized and are used to control specific types of algae, such as black algae.

It's also important to consider the size of your pool. Different algaecides are formulated for different pool sizes. Make sure to choose a product that is suitable for the size of your pool.

In addition, you should consider the active ingredients in the product. Some algaecides contain chlorine, which can be harmful if not used properly. If you are using a chlorine-based algaecide, make sure to follow the instructions carefully.

Finally, consider the cost of the product. Different algaecides can range in price, so you should choose one that fits your budget.

Conclusion

Choosing the right algaecide for your pool can be tricky, but by considering the type of algae you need to control, the size of your pool, the active ingredients in the product, and the cost, you can find the right product for your needs. With the right algaecide, you can keep your pool clean, healthy, and safe for swimming.

Frequently Asked Questions (FAQs)

1. When should you put algaecide in your pool?

Algaecide should be added to your pool water on a weekly basis to prevent algae growth. It acts as a backup to your regular sanitization program and helps prevent algae from starting and growing in the pool. It is recommended to add algaecide after every shock treatment.

2. How do I get rid of algae in my pool fast?

To quickly get rid of algae in your pool, vigorously scrub any surfaces covered in algae using a pool brush. Apply a green algaecide according to the label instructions. Allow the water to circulate for 24 hours, then brush the pool surfaces again. Finally, vacuum or backwash to remove any remaining dead algae.

3. What happens if you put too much algaecide in a pool?

Applying too much algaecide may cause foamy pool water, even with high-quality copper-based and silver-based algaecides. It is important to follow the recommended dosage to avoid this issue.

4. What kills algae permanently?

Bleach, specifically a solution with 5.25% hypochlorite, is effective at killing algae and preventing its return. However, it is crucial to avoid mixing bleach and chlorine together.

5. What kills algae the fastest?

Super-chlorinating your pool by adding shock is a fast way to kill algae growth. For severe algae problems, calcium hypochlorite shock, or cal-hypo shock, is recommended as an effective treatment.

6. Do you shock chlorine or algaecide first?

It is important not to mix chlorine and algaecide together. To effectively get rid of algae, first shock the pool and wait for the chlorine levels to fall below 5 PPM before adding algaecide.

7. Is shock or algaecide better?

Chlorine shock is usually the best option to eliminate green algae. However, if you're dealing with more chlorine-resistant algae like mustard algae or black algae, using an algaecide in conjunction with chlorine or other sanitizers may be necessary.

8. What naturally kills algae in a pool?

Bright sunlight can help reduce algae growth by breaking down the algae's food source - chlorophyll. Additionally, maintaining the correct pH levels in your pool water with baking soda can discourage algae growth.

9. Should I add shock after algaecide?

It is not recommended to mix chlorine shock and algaecide together as it renders both ineffective. First, shock the pool and wait for the chlorine levels to fall below 5 PPM before adding algaecide.

10. How long does it take for algaecide to get rid of algae?

Algaecides are designed to kill algae and typically work within a few hours. However, results may vary depending on the severity of the algae infestation.

Editor's Notes

During our swimming pool algaecide research, we found 24 swimming pool algaecide products and shortlisted 10 quality products. We collected and analyzed 216,071 customer reviews through our big data system to write the swimming pool algaecides list. We found that most customers choose swimming pool algaecides with an average price of $29.23.

The swimming pool algaecides are available for purchase. We have researched hundreds of brands and picked the top brands of swimming pool algaecides, including CLOROX POOL & Spa, HTH, poolrx, In The Swim, MAV AquaDoc. The seller of top 1 product has received honest feedback from 385 consumers with an average rating of 4.7.

Written by
Bryan Hicks Avatar

Bryan Hicks is a professional gardener and a writer who lives in North Texas with his family and his dog. Bryan has spent more than half of his life surrounded by garden products. He has extensive experience in garden makeovers and maintenance and lawn care. His areas of expertise include outdoor decoration, gardening and garden design.

Swimming Pool Algaecides Comparison Table

#TOP1
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#TOP3
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#TOP5
#TOP6
#TOP7
#TOP8
#TOP9
#TOP10
Brand CLOROX POOL & Spa CLOROX POOL & Spa HTH poolrx poolrx In The Swim CLOROX POOL & Spa In The Swim poolrx MAV AquaDoc
Item Weight 8 Pounds 2 Pounds 2.75 pounds 13.1 Ounces 16 ounces 2.92 Pounds 2.5 Pounds 2.5 Pounds 13.1 Ounces 2.1 Pounds
Item Form Liquid Liquid Liquid Tablet Tablet Liquid Liquid Liquid Tablet Liquid
Product Benefits Controls Algae Controls Algae Controls Algae, Maintains Clean Sanitized Water Controls Algae Eliminates and Controls Algae Algae Preventative Kills and prevents various types of algae, ensuring clean and clear pool water Controls Algae Controls Algae Controls Algae
Unit Count 128.0 Fluid Ounces 32.0 Fluid Ounces 32.0 Fluid Ounces 1.0 Count - 32 Fluid Ounces 40.0 Fluid Ounces 32 Fluid Ounces 1.0 Count 32.0 Fluid Ounces
FTB Score
ftb score rating icon 9.8
ftb score rating icon 9.7
ftb score rating icon 9.5
ftb score rating icon 9.4
ftb score rating icon 9.3
ftb score rating icon 9.2
ftb score rating icon 9.2
ftb score rating icon 9.0
ftb score rating icon 8.8
ftb score rating icon 8.7
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