Harris Sea Salt 10X Weed & Grass Killer SpraySea Salt 10X Weed & Grass Killer is a quick acting, non selective contact herbicide containing salt for which the residues degrade promptly in the soil. Foliar contact results in rapid desiccation and control of annual weeds and grasses, and top growth reduction of herbaceous perennial weeds and grasses. WORKS FAST TO KILL STUBBORN WEEDS: Harris Sea Salt 10X Weed & Grass Killer is a quick acting, non selective contact herbicide containing salt for