Hydrothol 191 Granular: Is a highly effective granular algaecide and herbicide. Apply when target algae and aquatic plants are actively growing. Note: susceptibility may vary due to subspecies, stains and environmental conditions.
For best results, use a Surfactant such as Cygnet Plus or Cide Kick ll with this product.
Algae Range
- .05 ppm: 3 lb per acre foot
- 3 ppm: 162 lb per acre foot
Weeds Range
- .75 ppm: 40 lb per acre foot
- 5 ppm: 270 lb per acre foot
Specific rates
- Dependent on species (see label)
Susceptible Weeds/Algae
Algae
- Plantonic, Filamentous and Branched
Weeds
- Bur Reed, Cabomba, Coontail, Egeria, Elodea, Horned Pondweed, Hydrilla, Hygrphilla, Milfoil, Sago Pondweed, Vallisneria, Water Stargrass, (Pondweeds: American, Largeleaf, Curlyleaf, Flatstem, Floating-leaf, Illinois, Narrowleaf,
Threadleaf, Variable Leaf)
Drinking
- Assay under .1 ppm
Livestock watering
- 0.3 ppm = 7 days
- 3.0 ppm = 14 days
- 5.0 ppm = 25 days
Irrigation
- 7 days*
See label for specific details