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Layered Bed

As relates to filtration, a multimedia filter bed containing, in the same vessel, several different filter media (such as anthracite, sand, and garnet) with specific gravities which differ enough to maintain different layers even after backwashing. layered bed

In ion exchange, a single exchange bed made up of two or more resins which have bead sizes and densities different enough to maintain layers after backwashing and which can be regenerated with the same regenerant. For example, a layered bed may have a mixed bed of anion resin on top and cation resin below that is regenerated by salt brine solution.