Tetra Pond Fountain Block Algae Control

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! Helps control algae growth in ornamental water fountains Clears cloudy water Each block treats between 30 and 80 gallons 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.Active Ingredients:Copper Sulfate Pentahydrate - 1.02%Diuron [3-(3,4-dichlorophenyl)-1, 1-dimethylurea] - 0.51%Other Ingredients: 98.47%Total: 100.00%