Hi Yield Aquatic Herbicide Is Designed To Control Weeds And Vegetation Above Ground That Border Large Ponds, Lakes, Streams And Rivers. Kills Vegetation Down To The Roots. Will not control plant growth under water. Could create a situation that could be harmful to fish. Because there are restrictions as to the locations that weed kills can be used near waterways, we are not selling this product over the internet. We want you to talk to us before you apply this herbicide. We just want you to know that this control is potentially available to you if the conditions are right. Active Ingredient: 53.8% Glyphosate. 1 Quart.