Recreational water illnesses (RWIs) are always a hot topic of discussion at the end of summer when higher bather loads at commercial aquatic facilities force filtration systems to work overtime to keep pool water clean and clear. Unfortunately, there are always outbreaks—some bigger than others, which everyone hears about via mainstream media. This article is not going to discuss the graphic descriptors of these microscopic invaders, but rather look at the methods for destroying and keeping these bugs out of pools.