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:Rounded natural aggregate, screened between 5 - 15 mm, and washed free from fines.
:Rounded natural aggregate, screened between 5 - 15 mm, and washed free from fines.
In most scenarios, a [[geotextiles|geotextile]] layer is unnecessary and have been associated with rapid decline and clogging in some circumstances.
In most scenarios, a [[geotextiles|geotextile]] layer is unnecessary and have been associated with rapid decline and [[Clogging#Filter fabric|clogging]] in some circumstances.
[[category: materials]]
[[category: materials]]