We have tried every ant baiter on the market. Most of our accounts have irrigation; pest and some have critters like racoon all of which affect the ant baiters. Some of the baiters we have tried keep water and animals out but they are so well built that ants cannot find the bait. The Knees baiter has solved all of the problems. As you can see in the picture, the Kness baiter has holes for easy ant entry in the stake. Water, either from rain or blown in from irrigation will not reach the bait. You can use liquid, granular, or gel baits. The dark green is ultra-violet resistant, breakdown is minimal as is evaporation of liquid baits. The cap is child proof, and often adult proof, and they are indestructable. All in all, it is the best and baiter on the market in my opinion. Cost is per unit.