Abstract: The influence of the release of non-condensable gas,escape of steam,and leakage of air on the optimized pumping-capacity,required to keep a pressure below 90 kPa in low-temperature multi-effect desalination(LT-MED)of seawater,was mathematically modeled and theoretically calculated.The original work was a more precise approximation of CO₂-release and air-leakage.For instance,the dependence of CO₂-release on the realistic situations,including but not limited to the initial temperature,evaporation temperature,salt solubility,pH-value,flow-rate and volume of the seawater-intake,could be calculated analytically and/or numerically.Moreover,the air-leakage was approximated to be a function of pressure and volume.The tentative discussions focused on the detailed calculation of specific cases.We suggest that the self-modified calculation,closer to the realistic situation,be of some basic and technological interest in development of LT-MED of seawater technology on industrial scale.