Algaedyn For Black Algae 1QT – Powerful Pool Algaecide Treatment

Our Top Performer Against Black Algae – Nothing Works Better

In our years of professional pool service, nothing has proven more effective against stubborn black algae than Algaedyn. This is our go-to solution when traditional algaecides fall short. When your pool is plagued by those dark, deeply rooted algae spots that resist brushing and shock treatments, Algaedyn breaks through where others fail. If you've battled black algae before, you know how aggressive it can be—Algaedyn is how we win that battle.

Aggressive Algae Requires a Powerful Formula

Black algae isn’t like other pool algae. Its outer layer protects it, and its deep roots help it anchor into plaster. It can also hide in tile grout, making it hard to get rid of. Algaedyn’s high-strength, copper-free formula penetrates biofilms and kills black algae at the root, not just the surface. That’s why it’s the trusted choice of pool professionals.

Safe, Non-Staining & Compatible with All Pool Types

Despite its strength, Algaedyn is gentle on your pool surfaces. It’s non-staining, does not cloud the water, and is safe for all pool finishes including plaster, fiberglass, vinyl, and tile. It works well with chlorine, bromine, and saltwater systems. This makes it the most versatile black algae treatment available.

Professional-Grade, Yet Easy to Use

Just one quart of Algaedyn treats up to 20,000 gallons of pool water. For the best results, brush the affected areas well to break the algae. Then, apply Algaedyn directly to the infested zones with the pump turned off. Leave it to circulate after 24 hours, then follow with shock treatment if necessary. Most customers see dramatic improvement after just one application.

When to Use Algaedyn

• Visible black algae spots that resist standard algaecides or chlorine

• After brushings when algae keeps returning

• On plaster or older pools where algae has embedded

• As a pre-treatment before drain-and-acid-wash jobs

Key Features

• Most effective black algae treatment we’ve tested in the field

• Penetrates root systems and biofilms—kills algae at the source

• Non-foaming, copper-free formula won’t stain pool surfaces

• One quart treats up to 20,000 gallons

• Works with saltwater, chlorine, and bromine pools

• Compatible with all pool types and finishes

• Easy-to-use liquid formulation with fast results

• Ideal for residential and commercial pool use