Top 10 Pool Algaecide Reviews and Buying Guide 2020

Algae is a common problem for many pool owners. Once it gets into your pool, it can bloom in a couple of hours, ruining your clear pool with seemingly disgusting colors. We all love our swimming pools, and it is our job to keep them clean and clear because if we don’t then, who will?

The development of pool algae is a result of being introduced into your pool through rain, swimmers, debris, or contaminated pool equipment. Although chlorine helps in preventing algae growth, it is encouraged by certain factors that limit the effectiveness of chlorine such as sunlight, high temperature, mineral content, and PH.

The best and most effective way of getting rid of algae is by the use of algaecides, chemicals specially designed for the task. Unlike chlorine, algaecides are not affected by temperature or sunlight hence works all day eliminating all algae and preventing their re-occurrence.

Types of pool algae

There are four well-known types of pool algae:

1. Green algae

Green algae are the most common type of pool algae. It can develop pretty fast along the pool wall or on the surface in floating patches. Although its a pesky nuisance due to its fast growth and difficulty in manual removal, it is quite easy to get rid of by the use of algaecides.

2. Black algae

Black algae are not black; they have a blue-green shade. It mainly develops in racks along the pool surface. Black algae are very hard to remove using regular pool cleaners, but high-quality algaecides do the trick.

3. Mustered algae

Mustered algae are commonly referred to as Yellow algae due to its brownish-yellow color. Due to its color, it is often misunderstood as green algae. Mustered algae have a slick and slimy feel. Its texture could help you distinguish it from dirt, which has a course feeling. It is resistant to chlorine, but algaecides aid in removing it. Mustered algae mainly grow on ladders, near lights, and on stairs.

4. Red algae

This is a different type of bacteria. It is resistant to chlorine and can even grow in the absence of sunlight. In pool terminology, it is mainly referred to as pink slime or pink algae.

5. Pool algaecides

Algaecides are chemicals that kill and prevent algae growth. They play an essential role in killing small, isolated blooms, but most work best in controlling and preventing algae growth.

Types of pool algaecides

1. Quat pool algaecides

They are also called quarterly ammonium compounds. Quat pool algaecides are technically detergents; hence their overuse can cause forming in tour pool. They function as microbial disinfectants. They attach themselves to the negatively charged algae cells, and once attached, they dissolve the outer protective membrane of the algae.

Once the algae’s protective membrane is dissolved, chlorine takes action, killing the algae, and thus your problem is solved. Quat pool algaecides are mainly sold in 10-50% concentration.

2. Metalic pool algaecides

Metalic pool algaecides contain copper ions. Copper has been used for thousands of years in water treatment. To prevent staining from overuse, especially in plaster pools, copper is chelated or bonded with amino acids.
Since copper ios are positively charged, they attach themselves to algae. They then penetrate the outer walls and poison the enzymes within the algal nucleus.

Metalic pool algaecides work well with black algae and are effective on green algae blooms as well. They are mostly sold in 7% strength or elemental copper concentration.

3. Polymer pool algaecides

Polymer pool algaecides are closely related to quad pool algaecides, the only difference being that they have longer carbon chains. They are advantageous in that they are non-staining and don’t form foam.

Polymers are strongly positively charged. The positive charges enable them to attach to the negatively charged algae. Once attached, they quickly spread over the algae cell surface, thus smothering the cells.

They are twice more powerful and effective than quad pool algaecides but are also more expensive. Polymer pool algaecides are mostly sold in 30% and 60% concentration/strength.

4. Sodium bromide

Although sodium bromide is not technically an algaecide, it is used in combination with granular chlorine to convert it into the potent algae killer, hypobromous acid.

Sodium bromide creates high levels of chlorine and bromine. Bromides are mostly used in out of control cases of algae growth to kill algae. Sodium bromide works well with yellow algae and green algae that are not responding well to chlorine alone.

Tips on how to use pool algaecides

1. Read and follow label instructions

It is vital to read labels instructions carefully to know water balance recommendations and dosage instructions before adding an algaecide to your pool.

2. Never add pool shock and algaecide at the same time

Pool shock destroys algaecides. It is essential to wait until the chlorine level is at least 5ppm before adding algaecide.

3. Balance pool water first

For algaecides to work effectively, pool water must be balanced. Avoid high alkalinity, PH, or calcium hardness. Optimum chlorine levels for algaecides to work effectively are 2-3ppm.

4. Avoid overdosing

You should read the dosage on the instructions label to match your pool size in gallons.

5. Clean your pool

Organic materials like leaves and lawn debris consume algaecides and make them less effective.

6. Improve circulation and filtration

Improved circulation and filtration helps to distribute the algae and remove suspended matter. Also, algaecides have little effect on stagnant water; hence circulation increases algaecides’ effectiveness.

Factors to consider when buying algaecides

1. Color of the algae

The color of the algae indicates the type of algae it is. Knowing the kind of algae helps you in choosing the best algaecide.

2. Pool-friendliness of the product

It is essential to choose a product that will not cause further damage to your pool.

3. Presence of bacteria

Pink or red algae is a bacteria and therefore requires a specific type of algaecide.

4. Quality of algaecide

Hight quality algaecides kill the algae in your pool faster and more effectively.

5. How long the product lasts

You should go for an algaecide that protects your pool longer to get full value for your money.

6. Whether it foams

You should choose a product that does not form as it allows you to use your pool within hours.

7. Cost of the fungicide

Buying the most expensive fungicide does not ensure quality. You should choose a fungicide whose price and quality you are comfortable with.

8. Clarifying ability of algaecide

For a clear, cloudless pool, you should select an algaecide that not only kills algae but also makes your pool clearer.

9. Effectiveness in all seasons

You should choose a product that protects your pool in all seasons, even winter, when your pool is closed.

10. Stain removing ability

Some algaecides might stain your pool. You should, therefore, choose one that does not cause staining.

Top Ten Best Algaecide Reviews 2020


This Eliminator kills and deters common green algae from developing in your pool. It is a fast-acting algaecide hence delivers results in a short time. Its non-forming formula gives you clear water. It also deters and kills algae in any type of pool or spa, even saltwater pools.

The algaecide lasts long; therefore, you don’t need to use it every day, once a week is enough for proper effectiveness. Its long-lasting ability and efficacy in small quantities not only save you time but also money because it means fewer trips to the store are required.

For perfect outcome with is used, Brush the pool surface weekly and add 1.5 fl oz per 10 thousand gallons of water after partial refill, heavy rain, or frequent backwash.


  • Has a non-forming formula
  • Effective in all types of pools
  • Kills green algae
  • Prevents algae from re-occurring


  • For proper effectiveness, a preventive algaecide may be required


It comes in four individual units. Each unit can support a 7.5 to 20K gallons swimming pool. It lowers chemical demand to improve your swimming pool water quality and lasts for about six months.

It is also effective in above ground pools. The product has a combination of minerals that continuously remove algae from your pool. For this product to work effectively, you need to choose the size of the product for your swimming pool unit.

The treated alloy product has a mineral formulation that dissolves into your pool for a shield that can last up to six months. The product not only prevents algae formation but also frees chlorine to be more active and productive in your pool.


  • Saves you money
  • Frees up chlorine making it more effective
  • Lasts up to six months
  • Great for use in above ground pools
  • Easily dissolves in water


  • It acts more as a preventive product


It treats up to 30K of water and offers protection for up to six months. To use, You put it in the pump basket or the skimmer basket.

The model was made to eliminate all types of algae and reduce chemical usage. It can also be used in a spa, jacuzzi, pool, or any other controlled water body.


  • Very effective
  • Easy to use
  • Kills all types of algae


  • Effective for six months only


It both kills and prevents algae formation in your pool. It also has a built-in clarifier that clears the water.

Its non-forming formula ensures your pool is always clear, and it is also ideal for all types of swimming pools.


  • Suitable for all swimming pools
  • Made by a reputable brand
  • Keeps water clean and clear


  • Not very durable


It is an all in one algae killer and helps in restoring the natural look of your swimming pool. The product is effective in killing black, green, and mustard. It also leaves your pool sparkling, clean, and free of contaminants.

You can use this product in facilities of up to 25K gallons.


  • Suitable for large pools
  • Kills all algae
  • Affordable


  • Not fast-acting. It takes time to kill contaminants.


It is a four-in-one product that kills and prevents algae from attacking your pool in the future. It works on green, yellow, and black algae. It is also quite affordable.

It has a non-forming formula that helps in keeping your pool water clear. It comes with a 60% strength, thus making it safe for use in all pools. It is also quite easy to apply to your pool.


  • Kills yellow, green and black algae
  • Has a non-forming formula
  • Has a 60% strength


  • It is not very effective


The product is copper-based and gives you over 15 doses in just one quarter because of its high concentration. It is used in small doses but works better than most of its rivals

It can control all types of algae and does not form foam. It is also very safe and reliable and kills and prevents algae from re-occurring in your swimming pool while keeping the water clean.

The product comes in various quantities and for great value enabling you to get a clean, algae-free swimming pool without digging too deep in your pocket. The recommended spring start-up dose for this product is four ounces per 10K gallons and two ounces per 10K gallons maintenance dosage, thus making it very economical.


  • Effective against most algae
  • Superior algae elimination power
  • Very safe hence you can swim immediately
  • Has a non-forming formula
  • Perfect for spring pool opening


  • Quite expensive


This product leaves the PH of your pool healthy and starves algae to death. Its effectiveness starts within eight hours. It also offers protection from black algae for up to 10 days. You can also use it in a salt pool.

Its clarifying properties help to clarify your facility’s water.


  • Starves all algae to death
  • Has a non-forming formula
  • Environmental friendly


  • Protection from black algae only lasts ten days.


This product removes all types of algae and prevents re-occurrence after use. It has a safe non-forming formula that not only works well with your facility but is also safe because it does not cause any damage.

It has a 60% concentration and provides your pool with the best clarity. It also lasts longer than other algaecides as it does not disperse immediately into the water. Its long-lasting ability makes it suitable for preventing re-emergence of algae.

This product also kills other micro-organisms in your swimming pool, leaving it free of contaminants. It can also be used in saltwater pools and is affordable.


  • Lasts long
  • Perfect for prevention and treatment
  • Clarifies pool water
  • Safe for use in all pools and filters
  • Non-forming formula


  • You cannot use your pool immediately after using this product


This product can be classified as one of the best products in the market. It removes and prevents algae from forming in your swimming pool.

One great feature of this product is it’s 90 days algae-free guarantee. It kills and prevents yellow algae, black algae, blue-green algae, and more.

It has a non-forming and non-staining formula. It contains about 1-8% copper sulfate pentahydrate and 3% copper as elemental.

It is an effective algaecide for your pool and spa. With this product, you will be satisfied with a clear algae-free pool.


  • Eliminates all types of algae
  • Very effective
  • Prevents algae re-occurrence
  • 90-days algae-free guarantee
  • It has a non-foaming and non-staining formula


  • It is a harsh chemical

Benefits of using pool algaecides

  • Kill algae
  • Prevents algae re-occurrence
  • Clean your pool

Frequently Asked Questions (FAQs)

1. Question: How often do I need to add an algaecide?

Answer: You should add an algaecide to your pool at least once a week. Adding algaecide on a weekly basis helps prevent algae occurrence in your swimming pool. You should also add it after every pool shock treatment.

2. Question: Can pool shock and algicides be used together?

Answer: Chlorine combines with algaecide ingredients, thus rendering it useless. The best time to add algaecide is after you’ve shocked your pool and chlorine level has fallen to 5ppm.

3. Question: After how long after adding algaecides, is it safe to swim?

Answer: Most algaecides are safe to swim in, but it is recommended you wait at least 30 minutes before swimming. Algaecides also come with instructions on their packs describing how long you should wait for before swimming in the pool after adding them.


You need to protect your pool at all times, from algae by maintaining proper chlorine levels and adding algicides. Algae should be killed as soon as it appears to stop its spread and damage to your swimming pool and filter. You can choose from any of the algaecides listed above to kill and protect your pool from algae.

Also, using these algaecides gives your pool that clean, crystal clear look you love so much and keeps it free from contamination.