The BAQUACIL CDX Pool Care System is a complete pool sanitizing system consisting of chlorine-free BAQUACIL SANITIZER AND ALGISTAT, BAQUACIL OXIDIZER, and BAQUACIL CDX. The product that actually kills bacteria in pool water is BAQUACIL SANITIZER AND ALGISTAT. The two other products in the system work with this product to keep your pool sparkling clear and algae free.