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