Assertion: filter's surface area | /r/HasProperty | robust
Facets:
value: in all weathers
type: LOCATION
value: mechanically
type: MANNER
Source sentences:
text: Ideal filter medium optimizes surface area for microbial attachment, wastewater retention time, allows air flow, resists plugging, is mechanically robust in all weathers allowing walking access across the filter, and does not degrade.