Dear Fernando, a couple of ...
Published by Nigel Heeler, Founder and Director at WaterReach Ltd
Dear Fernando, a couple of ideas - one is the biosand filter which is a household system effectively an indoor slow sand filter - see link (https://www.cawst.org/services/expertise/biosand-filter/more-information)
.The other is our ClariWash self washing filtration system suitable for communities up to 200 households - see leaflet attached. Let me know if you need more details - nigel.heeler@waterreach.co.uk
Both systems are for micro-biological contamination - not for desalination of groundwater.
Kindly Nigel Heeler
WaterReach