Another process of CO2 removal is called Ion Exchange Electrodialysis, which is a complex process where CO2 is passed over ion exchange resins reacting with the CO2 to form carbonate ions. At the same time, the resin is regenerated by an electrical field and by a system of counterflow, the carbonate ion concentrated in an adjacent cell. In the Sebatier process CO2 is reduced in combustion with hydrogen to form methane and oxygen. But this process has many disadvantages mainly due to the fact that it requires complex equipment requirements, a large mass of equipment and very high energy requirements and cooling down. This process has its disadvantages as it also requires large equipments and a large input of energy along with cool down requirements.
Replenishment gas is necessary in any habitat system because all systems leak to some extent.
A replenishment mixture is used to restore cabin pressure when it falls below a certain level. Nitrogen, helium, and sometimes even argon or neon can be used as carrier gases. The fundamental principal is that a carrier gas contributes to the partial pressures and mediates the level of oxygen. Two methods of gas removal, production and recycling are proposed for our manned-mission to Mars. The nitrogen and oxygen composition of the atmosphere will be controlled by signals from air an composition monitor and a special computer software.