This presentation, *When Algae Meet Bacteria in Wastewater*, showcases Algen, a company specializing in biofuels, greenhouse gas bio-sequestration, organic material extraction, and wastewater treatment. Instead of cultivating specific algae, Algen fosters natural algal growth with native microbiomes in treatment ponds. The presentation covers quorum sensing, horizontal gene transfer in algal-bacterial systems, and potential applications of these interactions in wastewater management for improved efficiency.