|align="center" valign="top"| {{Icon|file=Icon_under_development.png|alt=Gravity-driven water distribution|width=94|link=Gravity-driven water distribution}} <br> [[Gravity-driven water distribution]]
|}
{|style="height:140px; |align="center" valign="top"| {{Icon|file=Icon_commercialsm.png|alt=Commercial systems|width=94|link=Commercial systems}} <br> [[Commercial pumping systems|Commercial systems]]|}
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{|style="height:140px;
|align="center" valign="top"| {{Icon|file=Icon_commercialsm.png|alt=Commercial systems|width=94|link=Commercial systems}} <br> [[Commercial treatment and testing systems|Commercial systems]]
|}
{|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]]
|align="center" valign="top"| {{Icon|file=Icon_easygel.png|alt=Testing - Easygel|width=94|link=Testing - Easygel}} <br> [[Testing - Easygel]]
|}
{|style="height:140px; |align="center" valign="top"| {{Icon|file=Icon_commercialsm.png|alt=Commercial systems|width=94|link=Commercial systems}} <br> [[Commercial treatment and testing systems|Commercial systems]]|}
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