Hydrothol 191 20 lb Bag

This concentrated aquatic herbicide-algaecide is effective against a wide variety of submersed aquatic weeds and algae. Application rates range from:(granular)- 3 up to 136 lbs. per acre ft. of water. Due to fish toxicity, usage rates above (0.3 ppm) is recommended for commercial applicators only. Normal granular application rate for spot treatment of submersed weeds is 12 lbs. per 1,000 sq. ft. with 4 ft. avg. depth. Restrictions on water usage following treatment: watering livestock or domestic use- 7 to 25 days depending on application rate.