RETURN TO WP3 PIS: D. Achá and C. Molina [Contacts]Darío Achá: dacha@fcpn.edu.boC. Le Gouill: claude.legouill@ird.fr Development of low-cost alternatives for communities to purify wastewater: System of epuration basins for inland villages (overflowing basins).System of floating islands for village located at the edge of lacustrine hydrosystems Phytostabilisation (periphyton/totorales)