3 x 200g block treats 1000ltrs FREE Delivery

 1 block treats 1000L from 3mths depending on the fish stocking rate. 

 Natural Biological Filtration 

Pond blocks are made with porous materials (like volcanic rock, ceramic, or synthetic bio-media), which provide a huge surface area for beneficial bacteria to colonize. These bacteria: 

• Break down ammonia and nitrites from fish waste into less harmful nitrates.

• Help maintain a stable nitrogen cycle, reducing the risk of fish illness.

• Promote clearer water by reducing organic pollutants. 

Think of it as a mini ecosystem helper, silently cleaning your pond for you. 

 Reduces Algae Growth 

By improving water quality and nutrient balance, pond blocks limit the nutrients algae feed on, such as phosphates and nitrates. This helps: 

• Prevent algae blooms.

• Keep your pond visually appealing.

• Reduce the need for harsh chemical treatments. 

 Low-Maintenance Water Clarity 

Once placed in your pond, a pond block is largely maintenance-free and works continuously: 

• No electricity needed.

• No moving parts.

• Just place and let it work for months at a time. 

 Safe for Fish and Plants 

Don’t overload the pond with fish — blocks support balance, not miracles.