Osmio Reverse Osmosis Pre Filter Replacement Pack for the Osmio DO Range of Reverse Osmosis System, compatible with the Osmio DO Range and other standard reverse osmosis systemsContains1 x PP Sediment 5 Microns 1 x GAC Granular Activated Carbon Filter 1 x CTO Activated Carbon BlockOperating Parameters Temperature: Min 4°C, Max 38°C Pressure: Min 35psi, Max 80 psi Directions for use: place cartridge in an appropriate housing. Flush for a minimum of 10 minutes prior to use. Only use with water which is microbiologically safe.