3 Stage Compact RO System 12 Month Replacement Filter SetProduct Name: 3 Stage 50gpd Compact Aquarium ro system Years Supply replacement set USAGE: Prefilters for all Compact Reverse Osmosis Systems DESCRIPTION: Contains two of stage 1 filters and two of stage 2 filters. 2 x Stage 1 and stage 2 for the 3 stage compact reverse osmosis system Stage 1 Inline PP Sediment for reduction of heavy sediment, rust and dirt greater than 5micron Stage 2 Inline Activated Granular Carbon media for chlorine,heavy metals