Tetra Pond Fountain Blocks control the growth of unsightly algae in your ornamental fountain. Simply drop a block into your fountain and watch the algae disappear!
Initial dose may require 1 block for every 30 gallons of water. For regular algae control maintenance, replace the block when it becomes fully dissolved (usually after 10 days).
Important: For containerized ponds and fountains only. Use in compliance with all instructions. NOT FOR USE WITH LIVE FISH OR PLANTS.
Copper Sulfate Pentahydrate - 1.02%
Diuron [3-(3,4-dichlorophenyl)-1, 1-dimethylurea] - 0.51%
Other Ingredients: 98.47%