Targeted Treatment for Stubborn Black Spot Algae
Lo-Chlor Concentrated Black Spot Algae Killer is a highly concentrated algaecide developed specifically to treat light to heavy black spot algae infestations.
It is ideal for pools where black spot algae has become established or has proven difficult to remove with routine maintenance products. The concentrated formulation delivers effective penetration into the waxy protective coating that makes black spot algae so resistant.
Features & Benefits
- Targeted black spot treatment – formulated specifically to combat stubborn black spot algae.
- Concentrated and economical – small doses deliver strong curative performance.
- Effective on resistant algae strains – helps overcome algae that persists despite normal sanitation.
- Suitable for most pool finishes – safe for use in common residential pool surfaces when used as directed.
- Compatible with standard pool systems – works alongside recognised chlorine and salt chlorinated systems.
How It Works
Lo-Chlor Concentrated Black Spot Algae Killer uses a dual-action formulation that combines an organo copper complex with a quaternary ammonium compound to target stubborn black spot algae at its source.
At the recommended lower pH range, the algae’s waxy protective outer layer is softened, allowing the active ingredients to penetrate more effectively. This helps break down algae cells that cling tightly to pool surfaces and resist standard sanitising treatments.
The result is a more effective curative treatment for black spot algae that has become established or difficult to remove through routine pool maintenance alone.
How to Use
- Test and balance pool water before treatment.
- Reduce pH to between 7.0 and 7.2 for best results.
- Turn off the filter before adding the product.
- Add the calculated dose evenly around the pool, focusing near affected areas.
- After 2 hours, resume normal filtration.
- Brush affected areas to assist algae removal.
- Backwash or clean the filter as required, as dead algae will collect during treatment.
Dosage & Coverage
- Dosage: 1 litre treats 50,000 litres of pool water.
- For severe infestations, use in conjunction with Lo-Chlor Black Spot 900 Algaecide where appropriate.
Important Usage & Compatibility Information
- Suitable for use in pools with recognised sanitising systems, including chlorine and salt chlorinators.
- Not recommended for use in pools fitted with ionisers or Nature2 systems.
- Do not superchlorinate for 48 hours before or after using this product.
- Regular brushing improves effectiveness, especially where algae has previously been present.
- Foaming or a mild odour may occur during treatment and is a normal temporary effect.
- In salt chlorinated pools, fine surface bubbles may appear due to a temporary reaction in the chlorinator cell. These bubbles are harmless and typically resolve within 5–7 days, or immediately when the chlorinator is switched off.
- In some cases, combined chlorine levels may rise temporarily for 2–3 days. If this persists, Lo-Chlor Aqua-Boost may assist.
- Always test phosphate levels after algae treatment and address if required.
This product is an algaecide and must be used alongside a registered pool sanitiser. Ensure normal sanitising levels are restored and water is balanced before swimming.
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
How long does it take to see results after treatment?
Results vary depending on how long the black spot algae has been present and how deeply it has established. In many cases, visible improvement occurs within several days, with continued improvement as brushing and filtration remove dead algae.
Do I need to brush the pool during treatment?
Yes. Regular brushing is strongly recommended, particularly over affected areas. Brushing helps break the algae’s protective coating and improves penetration of the active ingredients, leading to better overall results.
When is it safe to swim after treatment?
Swimming should only resume once normal sanitiser levels are restored and water balance is within recommended ranges. Always ensure free chlorine levels are appropriate before bathing.
Will the product stain pool surfaces?
When used according to label directions, the product is suitable for most residential pool finishes. Always follow dosage and pH recommendations, and avoid overdosing to minimise the risk of surface or water discolouration.
Why is lower pH recommended for treatment?
Lowering the pH to between 7.0 and 7.2 softens the waxy protective layer surrounding black spot algae. This allows the active ingredients to penetrate more effectively and improves overall treatment performance.
Can this product be used as a regular preventative?
This product is designed as a curative treatment for active black spot algae. Once the algae is controlled, ongoing prevention is best achieved with a Lo-Chlor long-life algaecide and phosphate management where required.
What should I do if black spot algae returns?
Recurring black spot algae may indicate underlying issues such as poor circulation, surface porosity, or elevated phosphate levels. Follow-up treatment, improved brushing, phosphate control, and ongoing preventative dosing may be required.
