Fountain Block for backyard fountains and ponds will keep your water clear and remove algae.  Fountain Block is perfect for large water features as one block will treat up 30-80 gallons of water.  This is a great fountain care product to clear cloudy water caused by suspended algae.

• 6 Blocks, 1 Block Treats 50 U.S. Gallons
• Whole Package treats up to 300 U.S. Gallons
• Hazardous to animals and humans.