When using a GCMS duel column, when using one column at 1.2ml/min what should i do for the second column if it's on a deans switch (do i keep at same flow or lower? my service engineer has said drop it to 0.1-0.3ml/min but im scared of dmg to column

When using a GCMS duel column, when using one column at 1.2ml/min what should i do for the second column if it's on a deans switch (do i keep at same flow or lower? my service engineer has said drop it to 0.1-0.3ml/min but im scared of dmg to column

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