BioGuard Smart Sticks are a unique, chlorine based way to sanitize your pool. This product is unique because when the pump is turned off, the erosion rate also slows down. This makes the product last longer while continuously introducing chlorine into the water. It also has a built-in stabilizer, so the chlorine residual lasts longer. Smart Sticks work continuously to kill bacteria, and they simplify pool care with an easy skimmer application.