Targeted Control for Stubborn Algae
Lo-Chlor Algae Knock-Out is a professional-strength curative algaecide formulated to help control algae that may persist despite routine treatment.
Originally developed for all types of algae, it is now widely known as Lo-Chlor’s No.1 solution for stubborn and resistant algae strains, particularly in pebble pools and ageing pool surfaces where algae can cling tightly to pool surfaces.
Its dual-action formulation attacks algae cells directly while helping release clinging algae crusts from pool surfaces, allowing brushing and filtration to remove dead growth more effectively.
Features & Benefits
- Controls Resistant Algae Types – Effective against green, black spot, mustard, and pink algae, including strains that can persist despite routine treatment.
- Ideal for Pebble & Ageing Pool Surfaces – Helps loosen algae that clings to textured or worn finishes for easier removal.
- Dual-Action Performance – Breaks down algae cells while detergent action assists in lifting algae crusts and biofilm from pool surfaces.
- Compatible with Common Pool Systems – Suitable for use in salt chlorinated pools and ionised systems when used as directed.
- Professional-Grade Curative Treatment – Trusted for stubborn, recurring, or long-standing algae issues where extra strength is needed.
How It Works
Lo-Chlor Algae Knock-Out uses a dual-action quaternary ammonium formulation that targets algae at a cellular level while also helping lift surface film and residue from pool finishes.
As algae is released from the surface, brushing and filtration can remove it more effectively, supporting a cleaner finish and clearer water during the treatment process.
How to Use
- Test and balance pool water before treatment.
- Reduce pH to 7.0–7.2 for best results.
- Turn off the filter before adding the product.
- Pour the calculated amount of Algae Knock-Out near visible algae areas.
- Pool water may foam initially — this is normal.
- After 2 hours, resume normal filtration.
- Brush affected areas to help release algae from pool surfaces.
- Because dead algae are collected in the filter, backwashing or filter cleaning may be required.
Dosage & Coverage
- Initial Treatment: Use 500 ml per 10,000 litres of pool water.
- Maintenance Dose: Use 100 ml per 10,000 litres every 2–3 weeks if required.
Important Usage & Safety Information
- For severe algae infestations, use in conjunction with Lo-Chlor Black Spot 900 Algaecide where appropriate.
- In badly infested pools, phosphate control using Starver® Pool Maintenance is recommended to help limit algae regrowth after treatment.
- Foaming and a mild odour may occur and can persist for up to 10 days — this is normal during treatment.
- In some cases, combined chlorine levels may temporarily rise during treatment. This effect typically lasts 2–3 days.
- If elevated combined chlorine persists, the addition of Lo-Chlor Aqua-Boost may assist in restoring water balance.
- In salt chlorinated pools, fine surface bubbles may appear due to a reaction within the chlorinator cell. These bubbles are harmless and usually resolve within 5–7 days, or immediately when the chlorinator is switched off.
- 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.
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
How long does it take for Lo-Chlor Algae Knock-Out to work?
Results may begin to show within a few days, depending on the type and severity of algae present. Stubborn or long-standing algae can take longer to fully clear and may require brushing and continued filtration.
Do I need to brush the pool when using this product?
Yes. Brushing pool surfaces helps break up algae growth and allows the product to work more effectively, particularly on textured or older surfaces.
Can I use this product with a salt chlorinator running?
Yes, it can be used in pools with salt chlorinators. Temporary surface bubbles may occur during treatment and usually resolve on their own. Follow label instructions regarding normal operation.
Why does algae sometimes return after treatment?
Algae may return if underlying causes such as high phosphate levels, poor circulation, inadequate filtration, or unbalanced water are not addressed. Treating both the algae and its contributing factors helps achieve longer-lasting results.
Can I overdose this product for faster results?
Always follow the recommended dosage. Adding more product than directed will not speed up results and may increase foaming or temporarily affect water balance.
Can I swim after adding Lo-Chlor Algae Knock-Out?
Swimming should be avoided during treatment until the product has circulated and the pool water is clear and balanced again. Always follow the instructions on the product label before resuming swimming.
Why is phosphate testing recommended after treatment?
Phosphates act as a food source for algae. If phosphate levels remain high after treatment, algae may return. Testing and removing phosphates helps reduce the likelihood of regrowth after treatment.
Will this product replace chlorine?
No. Lo-Chlor Algae Knock-Out is an algaecide and works alongside chlorine or other sanitisers. A normal sanitising program is still required to maintain safe, healthy pool water.
Is this product safe to use?
When used as directed, the product is safe and effective. It is classified as Dangerous Goods, so care should be taken to avoid contact with skin and eyes, and it should be kept out of reach of children.
