Concentrated Granular Treatment for Black Spot Algae
Lo-Chlor Black Spot 900 Algaecide is a highly concentrated granular treatment formulated specifically for black spot algae in swimming pools.
It is designed for targeted application directly onto affected areas, where the slow-dissolving granules remain in contact longer for more focused treatment.
Features & Benefits
- Targeted black spot treatment – formulated specifically to treat black spot ‘blue-green’ algae.
- Highly concentrated formula – contains 900g/kg available chlorine as trichloroisocyanuric acid.
- Slow-dissolving granules – stays in contact with affected areas longer for more focused treatment.
- Non-metallic formulation – delivers targeted algae treatment without metallic additives.
How It Works
Lo-Chlor Black Spot 900 Algaecide uses a high-strength granular chlorine formulation containing 900g/kg available chlorine as trichloroisocyanuric acid.
Applied directly onto affected areas, the granules dissolve slowly to stay in contact with black spot algae for longer, improving penetration and treatment effectiveness on compatible pool surfaces.
How to Use
- Adjust pool water to approximately pH 7.2 before treatment.
- Apply the granules directly onto the affected area.
- Allow the product to remain in contact for 24–36 hours.
- Scrub with a wire brush if required.
Dosage & Coverage
- Dosage: 1kg treats 50,000 litres of pool water.
Important Usage & Compatibility Information
- Only suitable for pebblecrete, white plaster, and tiled pools.
- Do not use in vinyl liner, painted, coloured, or dark surfaces, as bleaching may occur.
- Effective treatment relies on correct water balance prior to application.
- Always test phosphate levels after algae treatment and address if required.
This product is classified as Dangerous Goods. Handle with care, avoid contact with skin and eyes, and keep out of reach of children.
Why Choose Lo-Chlor Algaecides?
Lo-Chlor Algaecides are developed for pool owners who value consistent results, long-term water clarity, and professional-grade formulations they can rely on season after season.
Manufactured in Australia and trusted by pool professionals, Lo-Chlor’s range focuses on stability, compatibility, and long-life performance — helping maintain balanced, clear pool water with less intervention and greater confidence.
Each formulation is designed to work in harmony with your pool system, supporting effective sanitation and water care without unnecessary complexity.
Frequently Asked Questions
What type of algae is Lo-Chlor Black Spot 900 designed for?
Lo-Chlor Black Spot 900 is formulated specifically for black spot algae, also referred to as blue-green black spot algae on pool surfaces.
Can this product be used in all pool types?
No. This product is only suitable for pebblecrete, white plaster, and tiled pools. It should not be used on vinyl liner, painted, coloured, or dark surfaces.
Why is this product applied directly onto the affected area?
Black Spot 900 is a concentrated granular treatment designed for targeted application. Placing the granules directly onto black spot algae helps keep the treatment in contact with the affected area for longer.
How long should the product remain on the affected area?
The granules are typically left in contact with the affected area for 24–36 hours before brushing if required. Always follow the product label for full directions.
Why is a lower pH recommended before treatment?
Treatment performs best when pool water is adjusted to around pH 7.2. Correct water balance helps improve contact and overall effectiveness during treatment.
Will brushing still be needed?
Yes. After the product has remained in contact with the affected area, brushing with a wire brush may still be needed to help remove stubborn black spot algae.
Can this product be used as a regular preventative?
No. Lo-Chlor Black Spot 900 is a targeted curative treatment for active black spot algae. Ongoing prevention is better managed with a suitable long-life algaecide and phosphate control where required.
Should phosphate levels be checked after treatment?
Yes. Phosphate testing is recommended after algae treatment, as phosphates can contribute to ongoing algae growth if left unmanaged.
