Drainage unit with external covering and method for manufacture
Drainage units comprise lightweight aggregate held within a perforated sleeve having an exterior surface, where at least a portion of the exterior surface comprises a barrier material which is substantially impervious to solids.
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | Drainage units comprise lightweight aggregate held within a perforated sleeve having an exterior surface, where at least a portion of the exterior surface comprises a barrier material which is substantially impervious to solids. |
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