Brondell H2O+ Circle Sediment and Carbon Replacement Filter Pack (RF-20) Replacement sediment and carbon filter set for the Brondell Circle reverse Osmosis system Quick change filters - twist and seal filters make filter replacement a breeze Replacement set contains a set of 3 filters: Sediment, Pre-Carbon Plus, and Carbon Block filter Gold Seal certified by WQA (Water Quality Association) for trusted performance Filter set for the Brondell Circle reverse osmosis water filter system