Our control systems are easy to install, evnvironmentally friendly, and economical. Experience a safer alternative than chemical sprays or other chemical applications to your yard. The contents of the solution is composed of common household items found in practically every kitchen that are safe when used as directed. The control system is up and running in a few simple steps. It is recommended that the units be refreshed every 14-30 days for optimal performance. During extremely warm temperature days, excessive evaporation of the water in the solution may occur, so it is important to monitor the solution levels particularly during the summer, at which time the solution level should be checked weekly. If the solution was recently replaced and the level appears to be low due to evaporation, simply add some water to bring the level back up. If complete evaporation has occurred, you will need to replenish the bottle control units with new solution.