When wondering what is the best weed killer for lawns you should also consider the best method of weed killer dispersal. Weed sprayers like the Roundup 1-Gallon Pump Sprayer are designed to meet all of your weed killer and insecticide sprayer needs. With three included sprayer nozzles the Roundup 1-Gallon Pump Sprayer ensures you re ready for any job. The poly adjustable tip regulates from a solid stream weed sprayer to a fine mist insecticide sprayer. The flat-fan tip spreads high volume weed killer for broad coverage of large areas like lawns and the foaming tip makes the ideal garden sprayer for herbicides. This 1-Gallon sprayer may be the best pump sprayer for cleaning decks and siding as well. Support sustainability efforts with this reusable weed sprayer and Roundup weed killer concentrate. One bottle of concentrate is equal to 10 bottles of ready to use weed killer spray.