Using ACE Ready-To-Spray Lawn Weed Killer Concentrate is an effective way to rid your lawn of broadleaf weeds. It acts quickly, by killing weeds right down to the roots. In fact you'll see results in just 24 hours. ACE Ready-To-Spray Lawn Weed Killer Concentrate has been specifically formulated to be safe for use on your lawn (when used as directed) as it will not harm grasses. It's not only effective, but easy to use too, just shake the bottle up, attach to a hose, and spray!