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===Geotextiles==={{:Geotextiles}}
→Geotextiles
{{:Choker layer}}
{{:Choker layer}}
[[Geotextiles]] may be used to enclose the underdrain on the vertical faces. It's use in horizontal layers within systems is not recommended as it has been demonstrated to [[clogging|clog]] over time in many installations.
==Alternative Technology==
==Alternative Technology==