| 摘要 |
A casing defines a cavity that extends along an axis and that has a top, a bottom and axially front and rear ends. The casing is configured to conduct a liquid along a flow path through the cavity from the front end to the rear end. A holding structure in the cavity defines a media chamber that can be filled with media for treating the liquid. The holding structure has a top passageway through which the liquid can flow downwardly into the media chamber and a rear passageway through which the liquid can flow rearwardly out of the media chamber. Blocking structures in the cavity constrain the flow path to extend through the top passageway into the media chamber and through the rear passageway out of the media chamber.
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