When black algae takes hold of your swimming pool, standard treatments often fall short. Hasa Algi-Ban Algaecide delivers a targeted, slow-dissolving solution that penetrates the tough outer shell protecting black algae colonies, breaking them down from the surface level. This non-staining, non-foaming granular formula is built specifically for white plaster pools, working both as an ongoing preventative measure and an aggressive treatment for active infestations. Powered by 99% Trichloro-s-trianzinetrione as its active ingredient, HASA Algi-Ban addresses what makes black algae so notoriously difficult to eliminate: its hard protective coating that resists conventional algaecides. The result is a pool free from unsightly algae growth with water that stays brilliantly clear, all without risking damage to your pool finish.

WARNING! This product is a strong oxidizing and bleaching agent and should not be used on vinyl, stained, painted, or colored pools.

Key Benefits

• Destroys All Algae Types: Engineered to combat every variety of pool algae, HASA Algi-Ban excels particularly against resilient black algae, delivering sustained protection that keeps your water pristine and visually clear.
• Gentle on Pool Surfaces: The slow-dissolving granules produce no staining or foaming, making this formula safe for white plaster pool finishes while still packing powerful algae-fighting capability.
• Penetrates Protective Algae Shells: With 99% Trichloro-s-trianzinetrione, this algaecide works by gradually dissolving the hardened outer layer of black algae that other products simply cannot breach.
• Dual-Purpose Formula: Apply it proactively to stop algae before it starts, or use it as an intensive treatment for existing outbreaks, making it an indispensable part of any pool maintenance routine.

What's Included

• Hasa 64122 2 Pound Algi-Ban

Specifications

• Brand: Hasa
• Part Number: 64122

Installation & Operation Tips

For algae growing on pool walls: Measure out 1 oz. (1/8 cup) of HASA ALGI-BAN and wrap it inside a cotton cloth. Secure with string and lower the bag into the water so it rests directly against the black algae patch. Leave the bag in contact with the affected area for 45-60 minutes, then remove it and scrub the algae away with a brush. For particularly stubborn spots, a second application or extended contact time may be required. When spot-treating walls or the pool floor, use the recommended dosage regardless of total pool volume.

For pools with widespread black algae contamination: First balance the pH and thoroughly brush all affected surfaces as described above. Broadcast a minimum of one pound of HASA ALGI-BAN per 4,000 gallons of pool water across the entire surface in a single application. Turn off the pump and allow the product to work undisturbed for 24 hours. After this period, perform a comprehensive brushing of all treated areas. If minor traces of black algae persist, repeat the full-pool treatment or switch to the spot-treatment method for remaining patches. For pools that have suffered prolonged neglect with extensive algae colonization, seek guidance from a qualified pool service professional.

WARNING! This product is a strong oxidizing and bleaching agent and should not be used on vinyl, stained, painted, or colored pools.

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