Tetra Pond Fountain Block (6 blocks) - Eliminates Algae Heater 6 or 8 hours with

6 or 8 hours with the photocell

They are cut from fish-safe

The waterfall spillway width is 11

During the vacuum cycle the holding tank fills with dirty water

Tetra Pond Fountain Block (6 blocks) - Eliminates Algae Heater 6 or 8 hours withTetra Pond Fountain Block is a great treatment for small container ponds, water features and fountains. It offers an easy and effective way to control and prevent growth of algae while also keeping the water crystal clear. Each treatment is a solid block that is added into the pond, making it a super easy, zero maintenance application! Replace block when fully dissolved (up to 30 days). Controls Algae: Helps prevent algae growth in ornamental water