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→Materials
===Materials===
===Materials===
<h4>Gravel storage layer</h4>
<h4>Gravel reservoir</h4>
{{:Gravel}}
{{:Reservoir gravel}}
{{:Pea gravel}}
<h4>Geotextile</h4>
{{:Geotextile}}
<h4>Biomedia</h4>
<h4>Biomedia</h4>
{{:Biomedia}}
{{:Biomedia}}