(DG) Note: This product cannot be shipped. It can be purchased at any of our stores. Store Locations.
Lo-Chlor Black Spot 900 Algaecide 1kg – Pool Chemical (DG)
Highly concentrated granular treatment for black spot algae in pebblecrete, white plaster, and tiled pools.
$42.00
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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.
| SKU | LC-50BS1K |
|---|---|
| GTIN | 9312113002767 |
| Barcode | 50BS1K |
| Brand | Lo-Chlor |
| Model | Black Spot 900 - 1kg |
| Product Type | Pool Chemical |
| Shipping Type | Standard |
| Chemical Type | Algaecides |
| Chemical Function | Black Spot Remover |
| Active Constituents | Trichloroisocyanuric acid: 900g/kg |
Shipping
Same-day dispatch applies to orders received by 12.00 pm (AEST) during business days. Orders received after 12.00 pm and on weekends or public holidays will be dispatched on the next business day.
Delivery fees are $19.95 flat-rate per order Australia-wide, no matter how many products are in it. Orders containing bulky items like sand filters, acoustic boxes, heat pumps, pool covers, and pool slides may incur additional fees as they require specialized carriers.
Below are the estimated time to arrival in business days once an order is shipped.
| Destination | Sydney | NSW | VIC | QLD | SA | WA/NT |
|---|---|---|---|---|---|---|
| Business Days | 1 - 2 | 2 - 4 | 2 - 4 | 2 - 4 | 3 - 4 | 5 - 6 |
Rural and remote addresses, where delivery is not provided every day, may take longer.
Returns
Satisfaction Guarantee: If you are not satisfied with a product for any reason, you are welcome to return it to us for a full refund or exchange within 30 days of the purchase date - even if you have used the product. Returns are free, and we will cover return shipping.
We take full responsibility for the safe arrival of the products that you order from us. We will replace at our expense any product that arrives faulty, damaged during transit, or is the incorrect product. Click here for details
If you have any questions about our shipping policy or our return policy, please contact us on 1300 766 619 or through our contact us form.