Having a pool is a great way to beat the heat in the summertime. However, they can be a lot of work to maintain. One important part of pool maintenance is keeping the water clean and algae-free. Algae can make your pool look dirty and uninviting, which can be tough to get rid of. That’s why it’s important to have a good algaecide on hand, so you can quickly and easily kill any algae in your pool.

There are a lot of different algaecides on the market, so how do you know which one is right for you? In this article, we’ll give you a rundown of the best pool algaecides, so you can find the perfect one for keeping your pool clean and clear all season long. Let’s get started.

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When Should I Use Algaecide in my Pool?

Algaecide should be used in your pool when you see algae starting to form. They can start to form in your pool for several reasons, including warm weather, high levels of pool use, and low levels of chlorine.

You should immediately add algaecide to the water if you see algae growth in your pool. They will kill the algae and prevent it from spreading.

You should continue to monitor your pool for algae growth and add algaecide as needed. If you have a lot of algae growth, you may need to shock your pool (with a high chlorine level) and then use an algaecide to kill all of the algae.

Top 5 Algaecide for Pools

When it comes to keeping your pool clean, one of the most important things you can do is prevent algae from taking over. Algae can make your pool look dirty and be dangerous for swimmers if it’s not removed properly. That’s why it’s important to always have a good algaecide on hand. Here are some of the best options.

1. HTH Super Algae Guard Algaecide – Best Overall

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  • Types of Algae: Many algae can grow in pools, including green algae, black algae, and yellow algae. This solution can be the best product for eliminating all of them.
  • Lasting Period: Algae can grow back quickly, but it will last long enough to keep your pool clean. The estimated lasting period is almost 3 months.
  • Capacity: The product is strong enough to handle the growth. 4 fl. oz. will work great in 10,000 gallons of water.

If you are looking for an effective and affordable algaecide, then the HTH Super Algae Guard Algaecide is a great option. This product is designed to kill and prevent algae growth in your pool quickly, and it also works to keep your pool water clean and clear.

It is the best Algaecide for pools because it kills and prevents all algae types, including green, black, and mustard algae. This easy-to-use DIY pool care product can be applied directly to the pool and only requires a 15-minute wait time before swimming. Additionally, this fast-acting formula is compatible with vinyl-lined and saltwater pool systems. It won’t fade your vinyl pool liner and provides crystal clear water.


  • Kills and prevents all types of algae
  • Lasts for up to 6 weeks
  • Great for vinyl-lined and salt water pool systems


  • It can cause skin irritation if exposed for too long
  • Some people may be allergic to the chemicals in Algaecide.

2. Clorox Pool And Spa Pool Algaecide – Runner-Up

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  • Lasting Period: Eliminates the algae in 24 hours and lasts for 8 weeks
  • Capacity: Can handle even the largest pools with a capacity of 10,000 gallons.

If you’re looking for the best budget Algaecide, look no further than Clorox Pool & Spa Pool Algaecide. This powerful product is designed to kill and prevent algae growth in pools, keeping your water clean and clear all season long. It is easy to apply; add it to your pool water according to the directions on the bottle.

It lasts up to 8 weeks, so you don’t have to worry about re-treating your pool frequently. It’s also safe for both people and animals, so you can rest assured that your family and pets are safe using the pool. With the long-lasting protection, you can enjoy your pool all season long without worry.


  • Non-foaming formula
  • It is easy to be applicable in the pool.
  • It is not harsh on swimming pool surfaces.


  • Some people may be allergic to it.
  • It can be expensive.

3. Pool RX 101066 6 Month Algaecide – Honorable Mention

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  • Types Of Algae: It prevents all types of algae like black, yellow, and green algae.
  • Capacity: Treats 20-30K gallons
  • Lasting Period: Effective for 6 months

If you are looking for an algae-killing product that is gentle on your pool and won’t break the bank, Pool RX 101066 is a great choice. This algaecide is made with granular minerals, a common and effective algaecide. It is also designed to be used in all types of pools, including saltwater pools.

It eliminates all types of algae and reduces the number of chemicals needed to keep your pool clean and healthy. It is also effective for up to six months, making it a great choice for those who want long-lasting results.


  • Simplifies Pool and Spa Care
  • EPA-certified
  • Effective and simple to use


  • Not suitable with copper ionizer

4. SeaKlear 90-Day Algae Prevention & Remover

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  • Types Of Algae: They are really effective in blue and black algae and do not quickly affect the green algae.
  • Lasting Period: It has a 90-day algae prevention and removal capacity, making it perfect for those who want to keep their pool clean and free of algae for an extended period.
  • Capacity: 16 fl.oz. per 10,000 gallons. Use 32 fluid ounces per 10,000 gallons of pool water for severe algae treatment.

It is another convenient and easy way to keep your pool clean and algae-free. This product comes with a 90-day no algae guarantee (when used according to instructions in balanced pool water), making it ideal for preventing and killing blue-green, green, yellow, black, and pink algae. Additionally, its non-foaming and non-staining formula make it safe for all types of pools. Use 16 fluid ounces per 10,000 gallons of pool water to prevent algae growth or 32 fluid ounces per 10,000 gallons for severe algae treatment.


  • Quick and easy to use on all pool types
  • Prevents and removes all types of algae
  • Capacity is great for larger pools


  • Doesn’t treat the severe algae effect.
  • It doesn’t work as well as advertised.

5. Kem-Tek KTK-50-0006 Pool and Spa 60-Percent Concentrated Algaecide

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  • Types of Algae: This product is most effective against green algae and works well against black and yellow algae.
  • Lasting Period: This Algaecide will last for up to 6 weeks in your pool or spa, provided that you maintain the proper chlorine levels.
  • Capacity: This bottle contains enough Algaecide to treat a 20,000-gallon pool, a long-lasting and effective one for eliminating the pool algae.

If you’re looking for an algaecide that’s compatible with saltwater pools, Kem-Tek’s is a great option. It’s specifically designed for saltwater pools and effectively kills and prevents all types of algae growth. It contains metal-free active ingredients, so it won’t stain your pool or discolor your swimsuits.

It is compatible with all pool and filter types, helps clarify pool water, and is long-lasting. This Algaecide is also non-foaming, making it easy to use. It is also safe to use around children and pets, so you can feel confident knowing that your family is safe while using it.


  • Non-foaming formula
  • Lasts up to 6 weeks
  • 60% concentration is effective for eliminating algae


  • The smell of this product is gross.
  • It can be harmful to fish if not used correctly.

Best Algaecide For Pools

ImageBest Algaecide For PoolsAverage Customer Review Link
HTH Super Algae Guard Algaecide4.5/5Amazon
Clorox Pool And Spa Pool Algaecide4.5/5Amazon
Pool RX 101066 6 Month Algaecide4.5/5Amazon
SeaKlear 90-Day Algae Prevention & Remover4.4/5Amazon
Kem-Tek KTK-50-0006 Pool and Spa 60-Percent Concentrated Algaecide4.5/5Amazon

Also Read: What Does Flocculant Do for Pools?

Features to Consider While Buying Algaecide for Pools

While many algaecides are on the market, not all are created equal. Here are a few things to keep in mind while shopping for an algaecide to ensure you are getting a quality product:

  • Active Ingredients: The active ingredient is the part of the algaecide that actually kills algae. Be sure to check the label to see what the active ingredient is and do some research on it to make sure it is effective.
  • Concentration: A higher concentration of the active ingredient will be more effective at killing algae, but it will also be more expensive. You’ll need to decide how much you’re willing to spend and how quickly you want the algae gone.
  • Lasting Period: Some algaecides only work for a short period, while others can last for months. If you live in an area with a lot of algae, you may want to choose an algaecide that will last longer to save you money in the long run.
  • Safety: Algaecides are chemicals, so you’ll want to make sure you choose one that is safe for your family and pets. Ensure that the product you select is designed for use in pools and that it is safe for human skin contact.
  • Ease of Use: Some algaecides require special equipment or mixing before they can be added to the pool, while others come in pre-measured packets that can simply be dropped into the water. Consider how easy the algaecide is to use before making your purchase.

How Do I Put Algaecide In My Pool?

Adding algaecide to your pool is a great way to keep it clean and free of algae. Here are a few tips on how to do it:

  • Deposit the algaecide in several spots around the pool. This will help ensure that it covers the entire area evenly.
  • Use a brush to spread it evenly around the pool. This will help ensure that all areas are covered and that there are no missed spots.
  • Run the filter for 24 hours afterward. This will help remove any residual algaecide from the water and keep the pool clean.
  • Ensure proper pH levels in the water. Algaecide can lower pH levels, so monitoring them closely and adjusting as needed is important.
  • Monitor the chlorine levels closely. Chlorine levels should be kept at a minimum when using algaecide, as it can cause them to rise too high.

Also Read: Best Pool Brush Pole

How Long Does It Take Algaecide To Work In Your Pool?

It is important to note that algaecide does not work immediately. It can take a few hours to a few days for the algaecide to kill the algae in your pool. The length of time it takes for the algaecide to work will depend on the type of algaecide you use, the severity of the algae problem, and the size of your pool.

If you are using an algaecide for the first time or have a severe algae problem, it is best to wait at least 24 hours before swimming. This will give the algaecide time to work and prevent you from coming into contact with potentially harmful chemicals.

Once the algae are dead, you will need to vacuum your pool to remove the dead algae and debris. You may also need to brush the sides of your pool to remove any stubborn algae growth. After vacuuming and brushing, your pool should be ready for swimming.


Do I Use Shock Or Algaecide First?

If you are starting with a new pool, you should use shock first. This will kill any bacteria that may be present in the water. Once the bacteria is gone, you can then add algaecide to prevent algae from growing.

Can You Put Too Much Algaecide In A Pool?

No, you cannot put too much algaecide in a pool. If you do, it can make the water unsafe to swim in. Always follow the directions on the algaecide package and only use the amount recommended for your pool size.

Should I Run The Filter After Adding Algaecide?

Yes, you should always run the filter after adding algaecide to your pool. This will help circulate the chemicals and evenly distribute them throughout the water.

Will Algaecide Help A Cloudy Pool?

Yes, algaecide can help a cloudy pool. If algae causes cloudiness, the algaecide will kill the algae and clear up the water.

Does Algaecide Make Pool Foamy?

No, algaecide does not make the pool foamy. If your pool is foamy, it is likely due to something else such as soap or detergent getting into the water. Also, look for non-foaming formulas if you are concerned about this.

How Do I Calculate The Amount Of Algaecide Needed For My Pool?

The amount of algaecide needed for your pool will depend on the size of the pool and the level of algae present. Follow the recommended dosage on the package for your pool size. You may need to increase the dosage if you have a lot of algae.


To sum up, the best algaecide for pools is the one that suits your particular needs the best. We have reviewed five great products that should be able to help you with your algae problems, so make sure to check them out. Also, don’t forget to consider the other factors we’ve discussed, such as the type of pool you have and the severity of your algae problem. With a little bit of effort, you should be able to get rid of those pesky algae for good.

Last Updated: November 20, 2022 / Categories: Outdoor & Garden, Pool & Spa / 11 min read / Tags: , , /

About the Author: Kara Toomey

Kara Toomey

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