Top 10 Best black algae in 2026

Last Updated - 6/14/2026

🏆Best Choice

Clorox Pool & Spa

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

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Pool Algae Treatment: Our Pool Algaecide and Clarifier is specially formulated to treat existing algae while providing long-lasting defense against stubborn growth, ensuring that your pool remains clear and algae-free for an extended period of time.
•Maintain Crystal Clear Water: Kills and prevents all types of swimming pool algae (green, mustard, black algae) for crystal clear swimming pool water.
•Non-Foaming Formula: Spend less time maintaining and more time enjoying your pool with this Swimming Pool Algaecide and Clarifier, which features a non-foaming formula.
•Suitable for Use in All Types of Pools: This product is proven to meet the needs of every pool owner, as it is compatible with all types of pools, including saltwater pools. You can trust our product to deliver exceptional performance and keep your pool water clean and clear.
•For best results, add to the deepest end of the pool with the filter running. Circulating pool water when applying chemicals helps disperse chemicals throughout the pool for maximum coverage
•Clorox Pool App: Test like an expert anytime, anywhere with the Clorox Pool App. Solve common swimming pool problems and get personalized product and dosage recommendations.

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$14.88

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poolrx

PoolRx Pool Unit #101066 6 Month Algaecide Treats 20k-30k gallons, Black

9.6

ChoiceComparer.com Score

9.6

/ 10

Outstanding

Main highlights

•Simply place in pump basket or skimmer basket
•Eliminates all types of Algae
•Reduces Chemicals
•Effective for up to 6 months
•Simplifies Pool and Spa Care. Replace the Poolrx unit in basket every 12 months.

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$67.94

$99.99

-32%

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HTH

HTH 67244 Swimming Pool Care Algae Guard Ultra - Long Lasting Formula, Eliminates & Prevents Green, Black, and Mustard Algae, Fast Acting & Effective Swimming Pool Chemical, 32oz

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•BENEFIT: Get long-lasting protection from extreme algae; This non-foaming algae control kills and prevents blooms of all algae types
•OUR STRONGEST ALGAE CONTROL: Kills, prevents and protects against regrowth of heavy green, black and mustard swimming pool algae for up to 3 months
•NON-FOAMING, FAST-ACTING: Add HTH Algae Guard Ultra directly to your swimming pool water and swim right away
•COMPATIBLE WITH ALL POOLS: This non-staining formula is great for all swimming pools including vinyl-lined and saltwater systems
•YOU'RE ALL CLEAR WITH HTH: For best results, use HTH Algae Guard Ultra every 3 months; Works great with HTH Shock products

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$42.66

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MAV AquaDoc

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

9.3

ChoiceComparer.com Score

9.3

/ 10

Excellent

Main highlights

•90 day no algae guarantee - Conquer Pool Season with AquaDoc pool algaecide: Keep your swimming pool clear of algae with our Double Whammy Algaecide. What's the Double Whammy? Ideal for inground and above ground pools, it eliminates mustard, green, blue and black algae effortlessly.
•Unique, Non-foaming & Non-staining algaecide that removes & prevents algae for 3 months. This copper algaecide is the answer to properly removing algae from your pool.
•Unlike harsh chemicals, this unique formula attacks algae at its core, preventing regrowth for long-lasting results. Think of it as a super algaecide for pool with lasting power!
•Reduces the amount of chemicals needed in your pool by making your sanitizer more efficient. The superior copper algaecide.
•Made in the USA: Experience the AquaDoc difference with Double Whammy Algaecide. All pool chemicals from AquaDoc are proudly made in the USA and held to the highest quality standards.

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$27.97

$35.99

-22%

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HTH

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

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•BENEFIT: Be all clear for more summertime fun; Use this powerful, non-foaming formula to kill and prevent heavy amounts of algae blooms for crystal clear pool water
•POWERFUL ALGAE CONTROL: HTH Algae Guard Advanced effectively destroys and prevents heavy green, black and mustard algae blooms
•NON-FOAMING, FAST-ACTING: Add HTH Algae Guard Advanced directly to your swimming pool water and swim right away
•COMPATIBLE WITH ALL POOLS: This product is great for all swimming pools including vinyl-lined and saltwater systems
•YOU'RE ALL CLEAR WITH HTH: For best results, use HTH Algae Guard Advanced as part of your weekly maintenance routine; Works great with HTH Shock products

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$24.98

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Pool Mate

Pool Mate 1-Quart Concentrated Black Algaecide, Algaecide for Pool, Made in USA

9.0

ChoiceComparer.com Score

9.0

/ 10

Great

Main highlights

•Controls the growth of black algae in swimming pools
•Concentrated formula for all pool types
•Weekly maintenance dose: 4 ounces per 10,000 gallons
•Non-foaming
•Non-metallic algaecide
•For All Pool Types (Vinyl, Fiberglass, Concrete, Gunite, etc.)
•Prevents and kills algae

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$37.78

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MAV AquaDoc

Copper Pool Algaecide for Swimming Pools - 64 oz - 90 Day Algaecide for Inground & Above Ground Pools, Helps Prevent & Remove Green, Mustard, Blue, Black Algae - AquaDoc

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•90 Day Algae Control - AquaDoc's Double Whammy Pool Algaecide helps keep your swimming pool clear of algae for 3 months. What's the Double Whammy? Ideal for inground and above-ground pools, it effectively tackles mustard, green, blue, and black algae.
•Unique, Non-Foaming & Non-Staining Formula - Enjoy clear pool water without mess or staining. This copper algaecide works in both inground and above-ground pools and helps remove & prevent algae for 3 months
•Targets Algae at its core - This unique formula is Designed to break the algae cycle and help prevent regrowth for long-lasting protection. Think of it as a super algaecide for pool.
•Helps Reduce Chemical Use - Makes your sanitizer work more efficiently, helping maintain clean water with less chemical demand.
•Made in the USA - Experience the AquaDoc difference with Double Whammy Algaecide. All pool chemicals from AquaDoc are proudly made in the USA and held to the highest quality standards.

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$59.99

$69.99

-14%

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In The Swim

In The Swim Black Algaecide – Eradicates Black Algae in Swimming Pools - Copper Sulfate Pentahydrate - 1 Quart

8.7

ChoiceComparer.com Score

8.7

/ 10

Good

Main highlights

•In The Swim's Black Algaecide is a specially formulated solution that eradicates black algae from your swimming pool.
•Our solution contains 11.8% copper sulfate pentahydrate, which breaks down black algae's tough denfenses that other solutions cannot.
•For the best results, it is recommended to thoroughly brush the surfaces of your pool, clean your filtration system, and super chlorinate your water prior to adding Black Algaecide.
•This solution has the ability to be a treatment or maintence algaecide in your swimming pool.
•NOTE: We are currently unable to ship Black Algaecide to DC, ID, MT, ND, RI, SD, UT, VT, AK or HI due to State Restrictions

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$24.99

$27.99

-11%

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APPLIED BIOCHEMISTS

Applied Biochemists 406303A Black Algaetrine Swimming Pool Algaecide & Deposit Control, 32 fl oz, White

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Algaecides is a combination of specially formulated for black algae
•Contains copper and exclusive penetrating agents to kill and prevent the growth of even the most deeply-rooted algae cells
•Allows for swimming without waiting; safe for all pool types and will not discolor the water when used as directed
•Most effective when applied in the morning on warm and sunny days
•Compatible with chlorine, bromine and ozone sanitizers

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$41.97

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