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Tetra Pond Block Slow Release

Warranty Information

  • Slow Release tablets to target and control algae growth.
  • For use in small ornamental fish ponds.
  • Safe for fish when used as directed.
  • Easy to handle and pre-measured.
  • Not for use in ponds with plants.

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Free US shipping for orders $99 and over pond supplies and accessories

  • Product Description
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Product Description

Tetra Pond's Pond Blocks keep your pond clean and clear by removing algae. Intended for use in containerized ponds and fountains only. 

Please Note: This product is fish safe in ornamental ponds when used according to manufacturer directions. However, like ALL copper-based algaecides, this product can be harmful to fish when overdosed. This product should also not be used with fish intended for consumption or in ponds with plants.

Tetra item #16735

Available in sizes:

Single Pack - treats 100-250 gallons.

4 Pack - treats 400-1,000 gallons.


Apply one block for every 100-250 gallons of water.

Replace block(s) when fully dissolved for long term algae control.

Other Details

Chemical Algae Control
String Algae Control
Green Water Algae Control
Recommended Pond Size:
0-500 gallons
Recommended Pond Size:
500-1500 gallons

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