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<!-- Content Column 3 ends here -->
|align="center" width="20%" | <!-- Content Column 4 starts here -->
{|style="height:140px"
|align="center" valign="top"| {{Icon|file=Icon_biosand.png|alt=Slow Sand Filter|width=94|link=Slow Sand Filter}}<br> [[Slow Sand Filter]]
|}
{|style="height:140px"
|align="center" valign="top"| {{Icon|file=Icon_biosand.png|alt=Concrete Biosand Filter|width=94|link=Concrete Biosand Filter}}<br> [[Concrete Biosand Filter]]
