in some way we must replace the T.E.G on the tray after a certain period. however, it is not efficient to do this by stopping the process. instead, we replace T.E.G CONTINUOSLY.New, dry T.E.G is pumped to the tray while the water-enriched T.E.G. flow out the tray meanwhile, the gas flows through the tray and partially dried. why do we say "partially"? Because one tray is not enough to dry the gas completely. the solution to this problem is to install several trays. if we look at the illustration, we see that there are seven trays. the gas flowing upward will progressively lose its water. this system is very efficient but it has some disadvantage.