Fountain & Water Feature Replacement Parts Water Treatment Pond Anti-Algae Block Sold 4 Block Per Package Tet16735.Pond Anti-Algae Pond Blocks will help keep Algae out of your pond! Pond Block offers an easy, effective way to control pond algae control. Simply drop into your pond regularly to maintain algae growth.
Keep pond algae under control and pond water clear! TetraPond Pond Blocks makes effective algae control as simple as tossing in a block into your pond once Every 10 To 30 Days. These pond blocks also help clear cloudy water and controls algae in ornamental fish ponds, water features and water fountains.
Directions: One block treats up to 250 gallons From 10 To 30 days. Use only as directed.