: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.