In open filters, which pairing of media is associated with superior organics removal?

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Multiple Choice

In open filters, which pairing of media is associated with superior organics removal?

Explanation:
In open filters, removing organics is strongest when the bed combines an adsorption-capable medium with a good depth-filter medium. Granular activated carbon (GAC) adsorbs dissolved organic compounds as water flows through it, capturing organics on its surface. Anthracite provides a porous, lightweight depth-filter layer that maintains hydraulic performance and prevents compaction, allowing water to spend sufficient time passing through the bed. Together, GAC and anthracite offer both adsorption capacity and effective filtration, giving superior organics removal compared with pairings that rely on media like sand, which does not provide meaningful adsorption for organics.

In open filters, removing organics is strongest when the bed combines an adsorption-capable medium with a good depth-filter medium. Granular activated carbon (GAC) adsorbs dissolved organic compounds as water flows through it, capturing organics on its surface. Anthracite provides a porous, lightweight depth-filter layer that maintains hydraulic performance and prevents compaction, allowing water to spend sufficient time passing through the bed. Together, GAC and anthracite offer both adsorption capacity and effective filtration, giving superior organics removal compared with pairings that rely on media like sand, which does not provide meaningful adsorption for organics.

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