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Lo-Chlor Winteriser Algaecide 500ML
Since the 1970sProven formulas
25+ countriesGlobal export
100% Aus madeOwned & operated
Lo-Chlor is Australia's most trusted specialist pool and spa chemical manufacturer globally recognised and exporting to 25+ countries. Their range covers algaecides, clarifiers, phosphate removers, stain treatments, stabilisers, spa care, equipment aids and more, every product formulated for Australian water chemistry and climate.
Lo-Chlor: Winter Solutions
Winteriser Algaecide
🍂 Autumn priority Slow release All pool types One-dose season cover
📋 How it works▾
Lo-Chlor Winteriser Algaecide keeps your pool algae-free through winter with a single treatment applied at pool close. The 500ml bottle is perfect for smaller pools up to 25,000L, or for pool owners wanting a lighter spring top-up dose. Developed specifically for cold-season conditions, it uses the same proven organic copper complex as the original Lo-Chlor Pool Algaecide, formulated to release slowly over the winter months.
Reducing chlorine levels over winter creates the perfect environment for algae to establish. A pre-winter Winteriser dose prevents that from happening, so you open to clean water in spring rather than a green pool that needs emergency treatment.
Lo-Chlor Winteriser Algaecide details
- Slow-release copper formula: one dose covers the full winter season
- Significantly reduces chlorine requirements over winter
- Safe for all pool surfaces and sanitiser systems
- Apply before reducing pump run times at pool close
Pair with Lo-Chlor Starver X Phosphate Remover before closing. Removing phosphates now means algae has no food source to fuel spring growth. For a full winterising approach, add Lo-Chlor Solar Shield to reduce evaporation and heat loss.
🔍 Does it suit my pool?▾
Select your pool type to confirm this product is right for you.
🧂Salt chlorinated▾
✓ Compatible: recommended for salt pools
Lo-Chlor Winteriser works with all chlorine-based systems including salt chlorinators. Salt pools are actually more vulnerable to winter algae growth as owners often switch off their chlorinator entirely during colder months. A Winteriser dose ensures protection continues without the chlorinator running.
💧Traditional chlorine▾
✓ Compatible: ideal for traditional chlorine pools
This is the most common use case for Winteriser. When you reduce your chlorine dosing over winter, this product provides continuous background algae protection. Apply in autumn before temperatures drop and you won't need to treat again until spring.
🪨Mineral / magnesium▾
✓ Compatible: works with all mineral systems
Lo-Chlor Winteriser is safe for all mineral and magnesium pool systems. It works independently of your sanitiser, so mineral system chemistry is unaffected.
⚡Ionised / Nature2▾
⚠ Use with care: consider metal-free alternative
Winteriser contains copper compounds. In ionised pools (such as Nature2 or Zodiac mineral systems) that already introduce copper ions, additional copper from Winteriser can cause staining. For ionised pools, we recommend Lo-Chlor Miraclear Metal-Free Algaecide as a winter treatment instead.
🏊Fibreglass▾
✓ Compatible: safe for fibreglass surfaces
Lo-Chlor Winteriser is formulated to be safe for all pool surfaces including fibreglass. Use at the recommended dose and it won't affect colour or surface finish.
🧱Concrete / pebblecrete▾
✓ Compatible: works with concrete and pebblecrete
Concrete and pebblecrete pools are particularly vulnerable to black spot algae establishing during winter. Winteriser's organic copper complex is especially effective against black spot, making it the ideal pre-winter treatment for these surfaces.
💊 Dosage guide▾
Applied once at pool close. Calculate pool volume: length × width × average depth × 1,000 = litres.
🍂 Winter close
500 ml
per 50,000 L
Single dose before reducing pump times. Lasts entire winter season.
🔥 Heated pools
750 ml
per 50,000 L
Increase dose if your pool is heated or covered, warmer water accelerates algae growth even in winter.
⚠ History of black spot
1 L
per 50,000 L
If your pool has had persistent black spot algae, use the higher dose to ensure full-season protection.
🌱 Spring top-up
250 ml
per 50,000 L
If opening in early spring while water is still cool, a light top-up dose extends protection.
❓ FAQ▾
When exactly should I add Winteriser?▾
Apply Winteriser in autumn as you're preparing to reduce your pool's chlorine levels and pump run times for the cooler months. Ideally when water temperature drops below 20°C. Add it after a final super-chlorination, allow 24 hours of circulation, then reduce your normal chemical routine.
Can I use it if the pool isn't being fully closed?▾
Yes, Winteriser is valuable even if you swim through winter. Use it as an autumn treatment to reduce how much algaecide you need through the colder months, and consider a lighter maintenance dose of Lo-Chlor Pool Algaecide monthly as a top-up.
Will it stain my pool?▾
No, provided pH and water balance are within normal range when you apply it. Copper-based algaecides can cause staining in pools with very low pH (below 7.0) or very high calcium hardness. Always test and balance water before adding any algaecide. For ionised pools, use a metal-free alternative instead.
Does it reduce how much chlorine I need?▾
Yes, significantly. By maintaining background algae protection through the winter months, Winteriser allows you to run your chlorinator on a reduced schedule (or not at all in some climates). This saves electricity and chemical costs, and extends the life of your chlorinator cell.
What if I forget to add it before winter?▾
You can still add it mid-winter, it's better late than not at all. If your pool has already started showing green water, treat the algae first with Lo-Chlor Pool Algaecide, then add Winteriser once the water is clear to prevent regrowth.
$18.15
Lo-Chlor Winteriser Algaecide 500ML—
$18.15
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Since the 1970sProven formulas
25+ countriesGlobal export
100% Aus madeOwned & operated
Lo-Chlor is Australia's most trusted specialist pool and spa chemical manufacturer globally recognised and exporting to 25+ countries. Their range covers algaecides, clarifiers, phosphate removers, stain treatments, stabilisers, spa care, equipment aids and more, every product formulated for Australian water chemistry and climate.
Lo-Chlor: Winter Solutions
Winteriser Algaecide
🍂 Autumn priority Slow release All pool types One-dose season cover
📋 How it works▾
Lo-Chlor Winteriser Algaecide keeps your pool algae-free through winter with a single treatment applied at pool close. The 500ml bottle is perfect for smaller pools up to 25,000L, or for pool owners wanting a lighter spring top-up dose. Developed specifically for cold-season conditions, it uses the same proven organic copper complex as the original Lo-Chlor Pool Algaecide, formulated to release slowly over the winter months.
Reducing chlorine levels over winter creates the perfect environment for algae to establish. A pre-winter Winteriser dose prevents that from happening, so you open to clean water in spring rather than a green pool that needs emergency treatment.
Lo-Chlor Winteriser Algaecide details
- Slow-release copper formula: one dose covers the full winter season
- Significantly reduces chlorine requirements over winter
- Safe for all pool surfaces and sanitiser systems
- Apply before reducing pump run times at pool close
Pair with Lo-Chlor Starver X Phosphate Remover before closing. Removing phosphates now means algae has no food source to fuel spring growth. For a full winterising approach, add Lo-Chlor Solar Shield to reduce evaporation and heat loss.
🔍 Does it suit my pool?▾
Select your pool type to confirm this product is right for you.
🧂Salt chlorinated▾
✓ Compatible: recommended for salt pools
Lo-Chlor Winteriser works with all chlorine-based systems including salt chlorinators. Salt pools are actually more vulnerable to winter algae growth as owners often switch off their chlorinator entirely during colder months. A Winteriser dose ensures protection continues without the chlorinator running.
💧Traditional chlorine▾
✓ Compatible: ideal for traditional chlorine pools
This is the most common use case for Winteriser. When you reduce your chlorine dosing over winter, this product provides continuous background algae protection. Apply in autumn before temperatures drop and you won't need to treat again until spring.
🪨Mineral / magnesium▾
✓ Compatible: works with all mineral systems
Lo-Chlor Winteriser is safe for all mineral and magnesium pool systems. It works independently of your sanitiser, so mineral system chemistry is unaffected.
⚡Ionised / Nature2▾
⚠ Use with care: consider metal-free alternative
Winteriser contains copper compounds. In ionised pools (such as Nature2 or Zodiac mineral systems) that already introduce copper ions, additional copper from Winteriser can cause staining. For ionised pools, we recommend Lo-Chlor Miraclear Metal-Free Algaecide as a winter treatment instead.
🏊Fibreglass▾
✓ Compatible: safe for fibreglass surfaces
Lo-Chlor Winteriser is formulated to be safe for all pool surfaces including fibreglass. Use at the recommended dose and it won't affect colour or surface finish.
🧱Concrete / pebblecrete▾
✓ Compatible: works with concrete and pebblecrete
Concrete and pebblecrete pools are particularly vulnerable to black spot algae establishing during winter. Winteriser's organic copper complex is especially effective against black spot, making it the ideal pre-winter treatment for these surfaces.
💊 Dosage guide▾
Applied once at pool close. Calculate pool volume: length × width × average depth × 1,000 = litres.
🍂 Winter close
500 ml
per 50,000 L
Single dose before reducing pump times. Lasts entire winter season.
🔥 Heated pools
750 ml
per 50,000 L
Increase dose if your pool is heated or covered, warmer water accelerates algae growth even in winter.
⚠ History of black spot
1 L
per 50,000 L
If your pool has had persistent black spot algae, use the higher dose to ensure full-season protection.
🌱 Spring top-up
250 ml
per 50,000 L
If opening in early spring while water is still cool, a light top-up dose extends protection.
❓ FAQ▾
When exactly should I add Winteriser?▾
Apply Winteriser in autumn as you're preparing to reduce your pool's chlorine levels and pump run times for the cooler months. Ideally when water temperature drops below 20°C. Add it after a final super-chlorination, allow 24 hours of circulation, then reduce your normal chemical routine.
Can I use it if the pool isn't being fully closed?▾
Yes, Winteriser is valuable even if you swim through winter. Use it as an autumn treatment to reduce how much algaecide you need through the colder months, and consider a lighter maintenance dose of Lo-Chlor Pool Algaecide monthly as a top-up.
Will it stain my pool?▾
No, provided pH and water balance are within normal range when you apply it. Copper-based algaecides can cause staining in pools with very low pH (below 7.0) or very high calcium hardness. Always test and balance water before adding any algaecide. For ionised pools, use a metal-free alternative instead.
Does it reduce how much chlorine I need?▾
Yes, significantly. By maintaining background algae protection through the winter months, Winteriser allows you to run your chlorinator on a reduced schedule (or not at all in some climates). This saves electricity and chemical costs, and extends the life of your chlorinator cell.
What if I forget to add it before winter?▾
You can still add it mid-winter, it's better late than not at all. If your pool has already started showing green water, treat the algae first with Lo-Chlor Pool Algaecide, then add Winteriser once the water is clear to prevent regrowth.
