Have tried no less than 10 "guaranteed to work" remedies for keeping deer fromeating my shrubs next to my house no doubt! Some worked better than others, but all of them had 1 thing in common. Reapplication after rain etc. This is as simple as hooking up to a garden hose and turning it on. Have seen no visible evidence ofdeer eating on (new or existing) growth since it has been in use. Approx 3 weeks!!*****ADDED BONUS****** My 5 year old grandaugher loves it too! She thinks it is a game of who she can fool into getting squirted.