Aqua One Algae Block Water Treatment
by Aqua One
Learn moreDescription:
Aqua One Algae Blocks provides a slow release to assist in the control of algae within your freshwater aquarium.
Key Benefits:
- Treats up to 120l - one piece per 20l
- Best used as a preventative or when algae first appears or after cleaning an algae infested aquarium
- Blocks will dissolve over 7-14 days depending on water conditions and circulation
- Suitable For: Coldwater & Freshwater Tropical
Directions:
To control algae, add one piece per 20 litres or one complete block per 120 litres of water. This block is best used as a preventative or when algae first appears or after cleaning an algae infested aquarium.
Blocks will dissolve over 7-14 days depending on water conditions and circulation. If possible, control the amount of sunlight or artificial light to reduce the growth rate of algae.
Repeat only when algae reappears. To prevent oxygen depletion, remove heavy algae growth mechanically before treatment and aerate the water after use.
Active Ingredient:
2.75g/kg Diuron
Reviews
"Surprised"
Posted byVince Vandergoeson7th Apr 2025This works very well. I was sceptical when I bought it but would recommend it
All orders are dispatched from Petdirect’s Auckland and Christchurch warehouses, offering fast, reliable delivery throughout New Zealand.
Standard Shipping
- Next working day delivery for most main centres
- 2 business days to regional areas
- 3 business days to rural addresses
Free shipping on orders $79.00 and over
Flat $5.90 delivery for smaller orders
Evening Express
This is ideal for urgent pet supply needs within the Auckland and Christchurch regions.
Available in eligible Auckland and Christchurch suburbs only.
- Same-day delivery if you order before 2pm Monday–Friday.
- Cost is $15.95 per order.
- Orders placed after 2pm or during weekends/public holidays will be delivered the next business evening.
- Eligible addresses can select evening express shipping at checkout.
See our shipping & delivery page for more information
You have 30 days to return products in original condition if you change your mind. Courier costs apply for change-of-mind returns.
If we made a mistake or your order is faulty or damaged, we’ll make it right — and cover the return shipping.
In-person returns are welcome at our Auckland store or Christchurch warehouse (by appointment).
See our full returns & refunds policy for more detail