The BAQUACIL CDX System is a chlorine-free system specially formulated to maintain a consistent oxidizer residual in pool water. The oxidizer residual in pool water plays a significant role in removing contaminants that put a strain on the pool and keeping the pool clear all season long. Better still, this system is ideal for all pools. Here's how it works: Sanitize with: BAQUACIL Swimming Pool Sanitizer and AlgistatOxidize with: BAQUACIL OxidizerMaintain oxidizer residual and water clarity with BAQUACIL CDX productFor areas where algae problems are prevalent or in pools with a history of recurring algae, a preventative dose of BAQUACIL Algicide or BAQUACIL Performance Algicide may be added to the weekly BAQUACIL CDX System routine during the hottest months of the summer. ***