Rainshow'r CQ-1000-DS Dechlorinating Shower Filter The CQ-1000-DS shower filters will remove 90% or more of chlorine NSF/ANSI certified for reduction of free chlorine Filters for 6 to 9 months for a family of 3 to 4 Uses KDF to remove chlorine from your shower water Also has quartz crystals to energize your shower water by reducing water surface tension which will increase sudsing and lathering