This zapper is the most low maintenance zapper out there at a great price.  I have it on a timer that turns it on at dusk and off after dawn.  It has even helped with the garden by killing the buggies that would otherwise snack on my fruits/veggies.  I don't even use the chemical for it and I've noticed a HUGE reduction in the mosquito population (not to mention free protein for the chickens!) I've used it the last half of the past summer and didn't have to clean it out at all as all the bugs fall right through the trap.  Yay!  Like others have said, keep it away from hang out areas as it does ATTRACT before it can kill.