The Waterblocs Pond-Blocs 2 x 100g twin pack treats up to 1,000L of water (or 4m² of water surface area).
Reapply every three months — at the start of each season for ponds and lakes.
Need a different size?
- Smaller (aquariums under 100L): see our 20g Mini-Blocs
- Larger (ponds 1,000L–5,000L): see our 200g Multi-Blocs or 1.2kg Maxi-Blocs
- Lakes & dams: see our Maxi-Blocs and Mega-Blocs range
A Natural Biological Treatment for Ponds, Lakes, Dams and Aquariums to Clear Up Cloudy Water
Waterblocs are a specially formulated porous mineral substrate containing multiple nutrients to promote the rapid growth of beneficial bacteria when immersed in aquatic water systems.
Waterblocs are suitable for fresh and salt water systems where fish, turtles, plants, pets and other organisms live.
Colonies of naturally occurring beneficial bacteria produce enzymes that consume organic waste, ammonia and unwanted nutrients that cause cloudy water and can deplete oxygen levels essential for aquatic life in a well-balanced ecosystem.
They will reduce the frequency of water changes in fish farms and aquariums. Ponds and lakes are dosed at the start of each season.
Directions for Use
- Place the recommended dose of Waterblocs underwater in an area with gentle or no water flow every three (3) months.
- Depending on water temperatures, Waterblocs will take several weeks to develop large populations of beneficial bacteria within the porous mineral substrate and around the ZEOLITE particles.
Best results are obtained when:
- Water temperature: 15°C and above
- pH level: 7.0
- Aeration: 3 ppm dissolved oxygen
Where to Place Waterblocs
- Aquariums: Totally or partially bury Waterblocs in aquarium gravel.
- Ponds & Lakes: Apply Waterblocs to the bottom of the pond or float near the surface.
- Fountains: Place in the water reservoir or in an area of low water turbulence.
- To treat sludge: Place Waterblocs directly in the sludge layer to stimulate the growth of anaerobic bacteria that devour organic waste. They will slowly biodegrade, leaving only a natural ZEOLITE residue beneficial to soils and harmless to the marine environment.
Recommended Dose
Increase dosages for stagnant waters, aquatic systems containing large amounts of organic waste, and in problem areas.
This pack: 2 x 100g Pond-Blocs treats up to 1,000L (or 4m² of water surface area).
Full Waterblocs dosage guide:
- 10g Aquarium-bloc → 25L (or 0.2m²)
- 20g Mini-bloc → 50L to 100L (or 0.4m²)
- 100g Pond-bloc → 500L (or 2m²)
- 200g Multi-bloc → 1,000L (or 4m²)
- 1.2kg Maxi-bloc → 5,000L (or 20m²)
- 6kg Mega-bloc → 200,000L
Frequently Asked Questions
Will 2 x 100g be enough for my pond?
The Pond-Bloc twin pack treats up to 1,000L of water (or 4m² of surface area). If your pond is larger, see our 200g Multi-Blocs (1,000L per bloc) or Maxi-Blocs (5,000L per bloc).
How often do I need to reapply?
Reapply Waterblocs every three months. Ponds and lakes are typically dosed at the start of each season.
Are Waterblocs safe for my fish and turtles?
Yes. Waterblocs are a natural biological treatment safe for fish, turtles, plants, pets and other aquatic organisms in both freshwater and saltwater systems.
How long before I see results?
Waterblocs take several weeks to develop large populations of beneficial bacteria within the porous mineral substrate, depending on water temperature. Best results are obtained when water temperature is 15°C and above, pH 7.0, with aeration to 3 ppm dissolved oxygen.
Where should I place the Pond-Blocs?
Place Waterblocs underwater in an area with gentle or no water flow. For ponds and lakes, apply to the bottom of the pond or float near the surface. For fountains, place in the water reservoir or in an area of low water turbulence.
Do I need to remove old blocs before reapplying?
No. Waterblocs slowly biodegrade, leaving only a natural ZEOLITE residue that is beneficial to soils and harmless to the marine environment.
Can I use Waterblocs in a pond used for drinking water?
No. Waterblocs™ have not been certified for water that will be used for human consumption.
Precautions and Safety Information
Handling: After immersion in water and once colonies of beneficial bacteria have developed, the product should only be handled with rubber gloves and a protective mask.
Safety Directions:
- Do not consume
- Keep out of reach of children
- Wash hands thoroughly after use
Important Note: Waterblocs™ have not been certified for water that will be used for human consumption.
