Water Dyes - Slow algae and weed growth!
The use of pond dyes has become a popular way to control aquatic weed growth. These dyes work on the light reduction principle. All plants need sunlight to grow. By reducing the amount of light penetration into the water, the dyes effectively reduce weed growth.
Early application is critical; dyes should be applied as early as possible in the growing season. To apply, simply pour liquid dye into pond (or throw the water-soluble bags in). The dye will completely mix throughout the pond within a short time. These dyes will not stop weed growth, but used consistently, they will greatly reduce it.