Targeted Treatment for Stubborn Black Spot Algae
Zodiac Pool Blackspot Remover is a specialised granular treatment for black spot algae attached to pebblecrete, white plaster and tiled pool surfaces. Its slow-dissolving trichlor formula keeps concentrated chlorine in contact with affected areas for longer.
Applied directly over affected areas, it provides concentrated treatment where normal chlorine levels may not be enough to control established black spot growth.
Features & Benefits
- Full-strength trichlor formula: Contains 900g/kg available chlorine for concentrated black spot treatment.
- Slow-release action: Dissolves gradually to extend chlorine contact over the affected area.
- Metal-free treatment: Controls black spot without adding copper to the pool water.
- Targeted surface application: Applied directly to affected areas rather than distributed throughout the pool.
How It Works
Black spot algae can anchor into porous pool surfaces and develop a protective membrane that reduces the effectiveness of normal chlorine levels. Thorough brushing helps disturb this outer layer and expose the algae beneath.
The slow-dissolving trichlor granules then release concentrated chlorine directly over the affected area. The extended contact time helps the treatment reach firmly attached black spot growth more effectively.
How to Use
- Confirm that the pool is pebblecrete, white plaster or tiled before treatment.
- Test the pool water and adjust pH to 7.2–7.6.
- Brush the affected areas thoroughly to expose the black spot growth.
- Turn the filtration system off to reduce water movement.
- Apply the product directly onto the affected areas according to the bottle directions.
- After treatment, brush the surfaces again, vacuum the loosened residue and restart filtration.
Important Usage Information
- Do not use on vinyl liners, fibreglass, coloured oxide surfaces, coloured grout or dark-coloured finishes, as bleaching may occur.
- Do not mix with other pool chemicals. Keep away from acids, combustible materials and organic products.
- Seek professional advice where black spot is widespread or repeated treatment may be required.
Maintain free chlorine at 2–4ppm and pH at 7.2–7.6. Keep Total Alkalinity at 80–120ppm for fully tiled, pebble and plaster pools.
This product is classified as Dangerous Goods. Wear protective gloves and eye protection when handling, keep the container tightly closed, and store it in a cool, dry, well-ventilated place protected from sunlight.
A Better Pool Experience Starts with the Right Chemistry
Zodiac pool chemicals support the key parts of everyday water care, from balance and sanitising to algae prevention, clarity, stain control and equipment protection.
Each product has a clear role in helping pool water stay cleaner, more comfortable and easier to manage, so the pool feels ready to enjoy more often.
Frequently Asked Questions
Can Pool Blackspot Remover be used in a fibreglass or vinyl pool?
No. It is intended for pebblecrete, white plaster and tiled pools only. The concentrated chlorine may bleach or damage vinyl liners, fibreglass and coloured pool finishes.
Why is black spot more common on porous pool surfaces?
Porous surfaces contain small openings and irregularities where black spot can anchor and develop below the visible surface. Smooth vinyl and fibreglass surfaces provide fewer places for this type of deep attachment.
What should I do if black spot covers a large part of the pool?
Widespread black spot may require repeated treatment, extensive brushing or professional surface assessment. Seek advice before applying the product across large areas to reduce the risk of bleaching or uneven surface treatment.
Does Pool Blackspot Remover replace normal pool chlorination?
No. It is a targeted surface treatment for black spot algae. Continue maintaining the normal sanitiser level and balanced water after treatment to help reduce the likelihood of regrowth.
Why should loosened algae be vacuumed after treatment?
Brushing and treatment can release dead algae and surface residue onto the pool floor. Vacuuming removes this material before it clouds the water or places unnecessary load on the filtration system.
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