You need to verify that dosen't happen high water level to avoid cross-contamination by entrainment due to high water levels occur at all times any evaporation can either high water level is experiencing.
To avoid cross-contamination by entrainment due to high water generation, from a high water do not know happens, it is necessary to confirm that the high water level does not occur in any of the evaporator at all times.
In order to avoid cross contamination caused by entrainment due to the high water level, the water level is not high, it is necessary to always take place in any of the evaporator to make sure that there is no high level. At