Dehydration units include glycol and molecular sieve (desiccant) units.  In both cases the core of the absorbing unit needs to be protected from dirt, hydrocarbon and gross aqueous aerosols.   A Triton particulate and aerosol removing filter upstream of a dehydration unit will protect it from dirt and aerosols.  Removing the contaminant significantly reduces the foaming in an amine contactor.   It may be necessary to add a carbon unit in front of some very sensitive molecular sieve units to capture hydrocarbon vapors.