Tetra Pond Algae Control Blocks, 50 Count, Dissolving Water Treatment

Tetra Pond Block is a 50-count dissolving treatment designed to control algae and help clear cloudy water in ornamental fish ponds and fountains.

• One block treats 100–250 gallons (380–950 L) — sized for the stated pond-water range.
• Initial dose: one block per 100 gallons (380 L) — gives a clear starting amount.
• Replace blocks after the previous ones dissolve, usually after 30 days — supports regular maintenance.
• Made for containerized ponds and fountains — suits these ornamental water features.
• Not recommended for ponds with live plants — helps clarify whether the product fits your setup.
• Helps control algae and clear cloudy water — supports clearer viewing of ornamental fish.

Algae can make fish harder to see and use oxygen in pond water. It is a natural part of aquatic environments, so the aim is to keep growth in check rather than make a pond completely algae-free. Tetra Pond Block is intended for ornamental ponds and fountains where algae control and cloudy-water clarity are concerns.

How does Tetra Pond Block help with algae?

Tetra Pond Block is designed to control algae growth and help clear cloudy water. Algae use photosynthesis to combine water and carbon dioxide, producing sugars that support their energy and growth. Keeping algae in check can help prevent it from obscuring colorful fish or depleting valuable oxygen.

• Algae are primitive plants that grow through photosynthesis.
• A balanced pond environment is part of keeping algae in check.

How many Tetra Pond Blocks should I use?

For the initial dose, use one block for each 100 gallons (380 L) of pond or fountain water. Each block is intended for a water volume between 100 and 250 gallons (380–950 L), so use the measured water volume to choose the amount for your pond.

• The treatment is supplied as 50 dissolving blocks.
• The stated water-volume range is for ornamental pond and fountain use.

When should I replace a block, and where can I use it?

For ongoing maintenance, replace the block or blocks after the previous ones have fully dissolved; this usually takes about 30 days. The blocks are intended for containerized ponds and fountains, but are not recommended for use with live plants.

• Wait until the previous block has fully dissolved before replacing it.
• Choose this treatment for ornamental water features without live plants.

Tetra has developed fish-food knowledge for fishkeeping enthusiasts since 1951. Tetra Pond Block suits pond keepers looking to manage algae in a containerized ornamental pond or fountain and follow a dissolving-block maintenance routine. It is intended for ornamental water features, not for use with live plants.