Check the listing for details. HYDRO LOGIC STEALTH RO150 REPLACEMENT FILTER PACK- 150 GPD MEMBRANE RO 150. Condition: New. Listed at 42.96 USD. NEW 3 Filter Set - Hydro Logic Stealth RO150 Replacement Carbon, Sediment Filter and RO Membrane 150 GPD Package Includes: 1 - Stealth RO Carbon Filter - This filter contains activated carbon, a substance that has a surface area of over a football field per gram. This filter purifies water beyond what most home filters are capable of, yet it is only a pre filter for the Stealth's advanced RO membrane. 1 - Stealth RO Sediment Filter - This filter removes large and medium sized debris from your water source. It is the first filter in the system and should be replaced or rinsed regularly. 1 - Stealth RO HF Membrane Filter 150 GPD- The RO Membrane filters water down to the microscopic level, allowing nothing bigger than a water molecule through.