Check the listing for details. 10" x 4.5" HydroLogic Pre-Evolution KDF/Catalytic Standard Carbon Filter HL22096. Color: White, Condition: New. Listed at 53.99 USD. Standard carbon pre-filter included with Evolution water filtration systemsReduces chlorine and chloramine in city waterReduces iron, hydrogen sulphide and heavy metals in well waterProvides Two Extra Stages of FiltrationExtends the Life of Your RO SystemUp to 7,500-Gallon Size:10-Inch by 4.5-InchProduct DescriptionStandard carbon pre-filter included with the Evolution system. For high-capacity chlorine and chloramine reduction in city water. Also for the reduction of iron, hydrogen sulphide and heavy metals in well water.From the ManufacturerStandard carbon pre-filter included with system. For high capacity chlorine and chloramines reduction for city water. Also for well water for iron, hydrogen supplied, and heavy metals reduction. KDF85 is the most advanced media that one can use when it comes to filtering water along with pre-treating water before Reverse Osmosis filters. KDF85 not only has incredible chlorine and chloramines removal capabilities but it can also be successfully used for those on well or spring water sources to remove many other contaminants that can cause major problems in your garden. Nutrient lockout can be caused by several factors in water quality. Water high in iron and sulfur can be very common problems that lead to decreased yield and quality. These contaminants can also quickly foul Reverse Osmosis membranes, so pre-treating the water and removing them is crucial to a properly operating filter system. KDF85 replacement filters are available for all Reverse Osmosis and de-chlorinating filters. Your beneficial micro-organisms will thrive and be at their healthiest population by removing these harmful substances. Your plants will thank you with bountiful harvest and superior quality. Pure water's not magic, it's logic!.