Changes

|style="background:#efefef;"|[[Image:granular filtration icon.png|center|link=http://akvo.org/wiki/index.php/Granular_filtrationGranular filtration]]|style="background:#efefef;"|[[Image:Icon_biosand.png|center|link=http://akvo.org/wiki/index.php/Upflow_roughing_filterUpflow roughing filter]]|style="background:#efefef;"|[[Image:Icon_biosand.png|center|link=http://akvo.org/wiki/index.php/Slow_sand_filterSlow sand filter]]|style="background:#efefef;"|[[Image:active carbon icon.png|center|link=http://akvo.org/wiki/index.php/Active_carbonActive carbon]]|style="background:#efefef;"|[[Image:membrane filtration icon.png|center|link=http://akvo.org/wiki/index.php/Membrane_filtrationMembrane filtration]]

|style="background:#efefef;"|[[Image:Filter_sand small.jpg|center|130px|link=http://akvo.org/wiki/index.php/Granular_filtrationGranular filtration]]|style="background:#efefef;"|[[Image:upflow roughing filter small.jpg|center|130px|link=http://akvo.org/wiki/index.php/Upflow_roughing_filterUpflow roughing filter]]|style="background:#efefef;"|[[Image:150px-Slow_sand_filter_small.jpg|center|130px|link=http://akvo.org/wiki/index.php/Slow_sand_filterSlow sand filter]]|style="background:#efefef;"|[[Image:Activated_carbon_bags small.jpg|center|130px|link=http://akvo.org/wiki/index.php/Active_carbonActive carbon]]|style="background:#efefef;"|[[Image:Reverse_osmosis small.jpg|center|130px|link=http://akvo.org/wiki/index.php/Membrane_filtrationMembrane filtration]]