Applied Biochemists Black Algaetrine – Black Algae Killer for Pools (406303A)
Heavy-Duty Algae Control for the Toughest Pool Contaminant
Defeat the most stubborn form of pool algae with Applied Biochemists Black Algaetrine®, a professional-grade copper-based algaecide specifically formulated to eliminate black algae in plaster, gunite, and concrete pools. Trusted by pool professionals, this fast-acting treatment penetrates deep into porous pool surfaces where black algae hides, ensuring a thorough and lasting clean.
Formulated with 7.4% chelated copper, Black Algaetrine (406303A) delivers maximum strength to kill and prevent even the most resistant black algae blooms—without staining or discoloration when used as directed.
The Ultimate Solution for Black Algae
Black algae is not like other algae. It develops tough, waxy outer layers that protect it from chlorine, making it extremely difficult to remove. It embeds deep into porous surfaces such as plaster, tile grout, and concrete, returning even after brushing or shocking.
Applied Biochemists Black Algaetrine attacks algae at the root, breaking down its protective coating and allowing sanitizers to fully penetrate and destroy the colony.
Key Benefits
-
Kills black algae at the root—not just the surface.
-
Penetrating formula dissolves protective layers for deep cleaning.
-
High copper concentration (7.4%) for fast, lasting results.
-
Chelated copper complex prevents staining or precipitation.
-
Long-lasting residual protection helps prevent regrowth.
-
Safe for all plaster and gunite pool surfaces.
When you’re facing black spots that keep coming back, this is the treatment that professionals trust to finish the job for good.
Professional-Strength Copper Formula
The secret to Black Algaetrine’s power is its chelated copper technology. Unlike basic copper algaecides that can fall out of solution or cause staining, this stabilized formula keeps the copper active, effective, and evenly dispersed throughout the pool water.
This ensures that the copper ions can reach deep into algae colonies, breaking down even the toughest growths while maintaining water balance and clarity.
Advantages of Chelated Copper
-
No staining or clouding on plaster or tile.
-
Stable under changing pH and chlorine levels.
-
Longer-lasting activity for sustained algae control.
-
Safe for all properly balanced pool systems.
It’s the safest and most efficient way to apply copper-based control to black algae without the risks of outdated formulations.
Designed for Plaster, Gunite, and Concrete Pools
Because black algae roots into the pores of rough surfaces, Black Algaetrine is specifically engineered for plaster, gunite, and concrete pools, where its penetrating power performs best.
It’s not recommended for vinyl or fiberglass pools, as those surfaces typically don’t harbor black algae and may require different treatment chemistry.
Easy Application for Fast Results
Black Algaetrine is powerful yet simple to use. Follow these steps for the best results:
Application Directions
-
Brush the affected areas thoroughly to break the algae’s outer coating and expose its roots.
-
Adjust pool pH to 7.2–7.6 and ensure sanitizer levels are within the normal range.
-
Add 4 ounces of Black Algaetrine per 10,000 gallons of water directly into the pool in the area of heaviest algae growth.
-
Circulate for at least 24 hours.
-
Re-brush stubborn spots after 24–48 hours to dislodge any remaining residue.
For severe infestations, a second dose may be applied after 3–5 days.
Long-Lasting Prevention and Maintenance
Once the black algae is eliminated, use 1 ounce per 10,000 gallons weekly as part of your normal maintenance routine. Regular use keeps copper levels steady and prevents new algae spores from taking hold.
This preventive step ensures your pool remains clear, sanitary, and free of the dark patches that indicate black algae regrowth.
Works Synergistically with Chlorine
While Black Algaetrine is strong on its own, it’s even more effective when used alongside chlorine. The chelated copper complex works with chlorine to oxidize organic matter and maintain water clarity—without creating foam or staining.
Compatible Sanitizer Systems
-
Chlorine and bromine systems
-
Ozone and UV sanitation setups
-
Saltwater chlorinators
By combining sanitizers with Black Algaetrine, you get the deepest and most complete algae control available for plaster and concrete pools.
Safe, Non-Staining, and Non-Foaming
Some copper algaecides can cause stains or turn pool water green due to precipitation. Black Algaetrine avoids these issues through advanced stabilization, ensuring copper stays in suspension and active in the water.
Safety Features
-
Non-staining when used at directed dosage.
-
Non-foaming—safe for high-circulation pools and spas.
-
No effect on chlorine efficiency or pH balance.
-
Safe for bathers after normal circulation resumes.
Your pool remains clear, balanced, and stain-free while benefiting from long-term protection.
Trusted Performance from Applied Biochemists
Applied Biochemists® has been a leading name in professional pool chemistry since 1956, trusted by service technicians and commercial operators across the country. Their Black Algaetrine product is a staple in the pool industry, known for consistent results, premium-grade ingredients, and unbeatable performance against black algae.
The Applied Biochemists Advantage
-
Formulated and tested for professional results.
-
Made with stabilized, high-grade copper complexes.
-
Backed by over 60 years of chemical expertise.
-
Trusted by pool technicians, operators, and homeowners alike.
When quality and reliability matter, Applied Biochemists Black Algaetrine delivers unmatched performance season after season.
Product Specifications
| Specification | Detail |
|---|---|
| Brand | Applied Biochemists® |
| Product Name | Black Algaetrine® |
| Model | 406303A |
| Type | Black Algae Killer |
| Active Ingredient | Copper Ethanolamine Complex (7.4% elemental copper) |
| Form | Liquid concentrate |
| Bottle Size | 1 quart (32 fl oz) |
| Coverage | Treats up to 160,000 gallons |
| Foam Level | Non-foaming |
| Surface Compatibility | Plaster, concrete, gunite |
| Copper Stabilization | Chelated for non-staining use |
| Application Rate | 4 oz per 10,000 gallons (initial) |
| Maintenance Rate | 1 oz weekly per 10,000 gallons |
Handling and Storage
Store in a cool, dry place, away from direct sunlight. Always follow label directions and avoid contact with metal surfaces, as copper compounds can react with untreated metals. Keep the product tightly sealed between uses.
Why Choose Black Algaetrine Over Standard Algaecides
Standard algaecides often fail to treat black algae effectively. Their chemistry simply can’t penetrate the tough, layered colonies that form on rough pool surfaces.
Applied Biochemists Black Algaetrine delivers:
-
Professional copper strength (7.4%) for deep penetration.
-
Stain-free, chelated formula for safer use.
-
Long-term residual protection against future blooms.
-
Fast results, visible within 24–48 hours.
It’s the industry’s most reliable way to eliminate and prevent black algae once and for all.
Buy with Confidence from Benchmark Pool Supply
At Benchmark Pool Supply, we carry only authentic Applied Biochemists products, trusted by pool service professionals and homeowners alike. The Black Algaetrine (406303A) provides unbeatable black algae control, combining powerful chemistry, easy application, and lasting protection.
We offer fast shipping, genuine OEM products, and expert guidance—so your pool stays crystal clear, balanced, and free from algae all season long.
Frequently Asked Questions
What type of algae does Black Algaetrine kill?
Applied Biochemists Black Algaetrine is designed to kill black algae, which grows deep into plaster and concrete surfaces and resists regular chlorine treatment.
Will it stain my pool?
No. The chelated copper formula prevents staining and water discoloration when used according to label directions.
Can I use it in a vinyl or fiberglass pool?
It’s best suited for plaster, gunite, and concrete pools. For vinyl or fiberglass surfaces, use a non-copper-based algaecide.
How soon can I swim after adding Black Algaetrine?
You can safely swim after normal circulation (about one hour) once the product is fully dispersed.
How often should I use it?
Use for treatment as needed and 1 oz per 10,000 gallons weekly to prevent regrowth.
