Check the listing for details. Hydro Logic Stealth RO200 Replacement Carbon Sediment Filter Membrane Hydron. Condition: New. Listed at 89.00 USD. Filters come in sealed packaging NEW 4 - Filter Set - Hydron Hydro Logic Stealth RO200 Replacement Carbon, Sediment Filter and RO Membranes 100 GPD Package Includes: 1 - Stealth / Hydron 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 / Hydron 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. 2 - Stealth / Hydron RO HF Membrane Filter 100 GPD- The RO Membrane filters water down to the microscopic level, allowing nothing bigger than a water molecule through. Product Features Package Includes: 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 advanced RO membrane. 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. RO Membrane Filter - The RO Membrane filters water down to the microscopic level, allowing nothing bigger than a water molecule through.