Tetra item #16735 - Tetra Pond's Pond Blocks keep your pond clean and clear by removing algae. Intended for use in containerized ponds and fountains only.
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.