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Pool Algaecides Comparison - June 2025
| 1 Best Choice  9.8Exceptional | 2  9.7Exceptional | 3 Best Value  9.5Excellent | 4  9.4Excellent | 5  9.2Excellent | 6  8.9Very Good |
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ModelIn 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 | Model Clorox® Pool&Spa™ Swimming Pool Algaecide, Prevents and Treats Pool Algae, Non-Foaming, 1 Quart (Pack of 1) | Model PoolRX+ pool unit 7.5k-20k gallons | Model SeaKlear 90-Day Algae Prevention & Remover, 1 Qt | Model HTH 67084 Pool Care Algae Guard Advanced, All Algae Eliminator for Swimming Pools - Fast-Acting, Destroys & Prevents Green, Black & Mustard Algae, Keeps Pool Water Crystal Clear, 32 fl oz | Model 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 |
BrandIn The Swim | Brand Clorox Pool & Spa | Brand poolrx | Brand SeaKlear | Brand HTH Store | Brand MAV AquaDoc |
Reviews | Reviews | Reviews  | Reviews | Reviews | Reviews - |
Features | |||||
Worth the money 9.3 | Worth the money 9.1 | Worth the money 8.6 | Worth the money 8.6 | Worth the money 8.6 | Worth the money 7.0 |
Simple to use 9.8 | Simple to use 9.6 | Simple to use 9.6 | Simple to use 9.4 | Simple to use 9.4 | Simple to use 8.6 |
Sheerness 9.6 | Sheerness 9.4 | Sheerness 9.1 | Sheerness 9.1 | Sheerness 8.9 | Sheerness 7.0 |
Long life 9.3 | Long life 9.3 | Long life 8.6 | Long life 9.3 | Long life 8.9 | Long life 7.0 |
Aroma 9.4 | Aroma 9.1 | Aroma 9.1 | Aroma 9.4 | Aroma 8.4 | Aroma 7.0 |
Tech Specs | |||||
product dimensions9.8 x 3.2 x 3.1 inches | product dimensions 3.13 x 3.13 x 10.19 inches | product dimensions 3.25 x 3.25 x 4.5 inches | product dimensions 6 x 6 x 9.5 inches | product dimensions 4.23 x 2.25 x 9.5 inches | product dimensions 3.15 x 3.11 x 9.61 inches |
item weight2.92 pounds | item weight 2 pounds | item weight 13.1 ounces | item weight 2.4 pounds | item weight 1 pounds | item weight 2.07 pounds |
customer reviews4.6 4.6 out of 5 stars 4, 872 ratings 4.6 out of 5 stars | customer reviews 4.6 4.6 out of 5 stars 7, 840 ratings 4.6 out of 5 stars | customer reviews 4.5 4.5 out of 5 stars 4, 046 ratings 4.5 out of 5 stars | customer reviews 4.4 out of 5 stars 3, 715 4.4 out of 5 stars | customer reviews 4.6 4.6 out of 5 stars 891 ratings 4.6 out of 5 stars | customer reviews - |
Review | Review - | Review | Review - | Review - | Review - |
Available On | Available On  | Available On  | Available On | Available On  | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.8
1In The Swim12% OffIn 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
9.8 Simple to use9.6 Sheerness9.4 AromaWhy we love it
Highly effective against algae growth.
Safe for immediate swimming.
Non-foaming with low odor.
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9.7
2Clorox Pool & Spa19% Off
Clorox® Pool&Spa™ Swimming Pool Algaecide, Prevents and Treats Pool Algae, Non-Foaming, 1 Quart (Pack of 1)
9.6 Simple to use9.4 Sheerness9.3 Long lifeWhy we love it
Non-foaming formula keeps water clear.
Effective long-term algae prevention.
Suitable for all pool types.
Pool Algaecides Buyer's Guide
Written by Dan GibsonIntroduction to Pool Algaecides
Pool algaecides are chemical compounds used to kill and prevent the growth of algae in swimming pools. These algaecides are generally available in liquid, tablet, or granular form. They are used to control the growth of algae, bacteria, and other microorganisms that can cause cloudy water and other problems in swimming pools. Selecting the right algaecide for your pool depends on many factors such as the size of the pool, the type of pool, any existing algae infestations, and the pool's environmental conditions. In this buying guide, we will discuss the different types of pool algaecides and their various applications.
Types of Pool Algaecides
Pool algaecides come in a variety of types and formulations, each with its own advantages and disadvantages. The most common types of pool algaecides are quaternary ammonium compounds (QUATs), polyhexamethylene biguanide (PHMB), and copper-based algaecides. QUATs are the most commonly used algaecides, as they are highly effective against most types of algae. They are also non-toxic and biodegradable. PHMB is also a popular choice, as it is effective against a wide range of algae and bacteria. However, it can be toxic to some aquatic life. Copper-based algaecides are also effective, but they can stain the pool's surfaces, and they can become toxic to humans and aquatic life if used improperly.
Choosing the Right Algaecide for Your Pool
When choosing an algaecide for your pool, you should consider the size and type of your pool, the type and amount of algae present, and any other environmental factors that might affect the choice of algaecide. For example, if you have a small pool, you may want to opt for a concentrated algaecide that can be used in smaller quantities. If you have a large pool, a granular algaecide may be more suitable. For green pool algae, a copper-based algaecide may be more effective, while for other types of algae, a QUAT or PHMB may be the better choice. Additionally, you should take into account any other chemicals you may be using for pool maintenance, as some algaecides may react with them.
Application of Pool Algaecides
Once you have selected the appropriate algaecide for your pool, you should follow the manufacturer's instructions carefully when applying it. Generally, you should add the algaecide directly to the pool water and then brush the sides and surfaces of the pool. Additionally, if your pool has an automatic feeder, you can add the algaecide to the feeder, which will then distribute it evenly throughout the pool. Lastly, make sure to check the pH levels of the pool water after the algaecide has been added, as some algaecides may alter the pH level.
Safety Precautions
When using pool algaecides, you should always take the necessary safety precautions. Wear protective clothing and gloves when applying algaecides to your pool. Additionally, make sure to keep children and pets away from the pool during and after application. If you are using a copper-based algaecide, make sure to rinse off the pool surfaces after application to avoid staining. Lastly, always read the product label and follow the manufacturer's instructions carefully to avoid any safety risks.
Conclusion
Pool algaecides are an important part of pool maintenance, as they help to keep algae, bacteria, and other microorganisms in check. When selecting an algaecide for your pool, it is important to consider the size and type of pool, the type and amount of algae present, and any other environmental factors that might affect the choice of algaecide. Additionally, always follow the manufacturer's instructions carefully when applying algaecides, and take the necessary safety precautions to avoid any potential risks. With the right algaecide, you can keep your pool clean and clear all season long.
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