Hydro Logic Replacement Filter Kit for Pre-Evolution Pre-FilterThis Kit contains replacement filters for the Hydro Logic Pre Evolution High Capacity Pre Filter for the Evolution RO Included in this kit: Pre Evolution Choice between ChloraShield Carbon Filter OR Upgraded KDF CAT Carbon Filter Pre EvolutionSediment Filter Pre Evolution ChloraShield Carbon Filter 100% Chloramine Removal 1 micron rating Rated at 1 GPM Low pressure drop combined with exceptionally high dirt holding capacity Great for city water