Another reason to decant wines is to separate the clear wine from the sediment resting at the bottom of the bottle. This is generally only needed for older wines. While there is no specific requirement for a decanter that is suitable for this type of decanting, you might want to keep in mind that a decanting funnel, one with a screen, can come in handy, particularly with port.
Holiday Gift Guide, Decanters
Why do we use them and which kind should you buy?
Decanting for Sediment